Alopecia differential diagnosis: Difference between revisions

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__NOTOC__
{{Alopecia}}
{{Alopecia}}
{{CMG}} [[Ogechukwu Hannah Nnabude, MD]]
{{CMG}} [[Ogechukwu Hannah Nnabude, MD]]
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==Overview==
==Overview==


There is a very wide list of diseases and conditions that can lead to alopecia. Proper history taking and physical examination, along with laboratory, microbiology, and in some cases, imaging studies, are helpful in narrowing down the diagnosis.
There is a very wide list of diseases and conditions that can lead to [[alopecia]]. Proper history taking and physical examination, along with laboratory, microbiology, and in some cases, imaging studies, are helpful in narrowing down the diagnosis.
[[Alopecia]] can be caused by many different diseases. Some of the most well known and common causes are: [[androgenetic alopecia]], [[alopecia areata]], [[telogen effluvium]], anagen effluvium, traction alopecia, and [[trichotillomania]]. Endocrine disorders such as [[hypothyroidism]], [[hypoparathyroidism]] and [[Cushing's syndrome]] as well as [[malnutrition]] and medications are also possible causes of alopecia.
[[Alopecia]] can be caused by many different diseases. Some of the most well known and common causes are: [[androgenetic alopecia]], [[alopecia areata]], [[telogen effluvium]], [[anagen effluvium]], [[traction alopecia]], and [[trichotillomania]]. Endocrine disorders such as [[hypothyroidism]], [[hypoparathyroidism]] and [[Cushing's syndrome]] as well as [[malnutrition]] and medications are also possible causes of [[alopecia]].


==Differentiating Alopecia from Other diseases==
==Differentiating Alopecia from Other Diseases==


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| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Androgenetic Alopecia
| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Androgenetic Alopecia <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> <ref name="pmid30513014">{{cite journal| author=Rinaldi F, Marzani B, Pinto D, Sorbellini E| title=Randomized controlled trial on a PRP-like cosmetic, biomimetic peptides based, for the treatment of alopecia areata. | journal=J Dermatolog Treat | year= 2019 | volume= 30 | issue= 6 | pages= 588-593 | pmid=30513014 | doi=10.1080/09546634.2018.1544405 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=30513014  }} </ref> <ref name="pmid26455063">{{cite journal| author=Vidal CI| title=Overview of Alopecia: A Dermatopathologist's Perspective. | journal=Mo Med | year= 2015 | volume= 112 | issue= 4 | pages= 308-12 | pmid=26455063 | doi= | pmc=6170065 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26455063  }} </ref>
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* Male pattern: The frontal hairline is thinner, hair loss occurs at the crown of the scalp, hair recession is seen at the temporal aspects of the scalp; Female pattern: Hair loss occurs at the crown of the scalp, however the frontal hair line remains preserved. <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref>
* Male pattern: The frontal hairline is thinner, hair loss occurs at the crown of the scalp, hair recession is seen at the temporal aspects of the scalp; Female pattern: Hair loss occurs at the crown of the scalp, however, the frontal hairline remains preserved.  
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* It is the most common cause of hair loss.<ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> Unlike in telogen effluvium, hair pull test shows a less than 20% telogen count .<ref name="pmid26455063">{{cite journal| author=Vidal CI| title=Overview of Alopecia: A Dermatopathologist's Perspective. | journal=Mo Med | year= 2015 | volume= 112 | issue= 4 | pages= 308-12 | pmid=26455063 | doi= | pmc=6170065 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26455063  }} </ref>
* [[Androgenetic alopecia]] is believed to have a worldwide [[prevalence]] of about 50,000 per 100,000 men and 15,000 per 100,000 women with post-menopausal women making up the majority.  
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* Diagnosis is mostly clinical and is based on the pattern and absence of other explanations.
* Unlike in [[telogen effluvium]], [[hair pull test]] shows a less than 20% telogen count.
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* It is the most common cause of hair loss.
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| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Alopecia Areata
| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Alopecia Areata <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> <ref name="pmid29241771">{{cite journal| author=Strazzulla LC, Wang EHC, Avila L, Lo Sicco K, Brinster N, Christiano AM | display-authors=etal| title=Alopecia areata: Disease characteristics, clinical evaluation, and new perspectives on pathogenesis. | journal=J Am Acad Dermatol | year= 2018 | volume= 78 | issue= 1 | pages= 1-12 | pmid=29241771 | doi=10.1016/j.jaad.2017.04.1141 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=29241771  }} </ref> <ref name="pmid7791384">{{cite journal| author=Safavi KH, Muller SA, Suman VJ, Moshell AN, Melton LJ| title=Incidence of alopecia areata in Olmsted County, Minnesota, 1975 through 1989. | journal=Mayo Clin Proc | year= 1995 | volume= 70 | issue= 7 | pages= 628-33 | pmid=7791384 | doi=10.4065/70.7.628 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=7791384  }} </ref> <ref name="pmid24202232">{{cite journal| author=Mirzoyev SA, Schrum AG, Davis MDP, Torgerson RR| title=Lifetime incidence risk of alopecia areata estimated at 2.1% by Rochester Epidemiology Project, 1990-2009. | journal=J Invest Dermatol | year= 2014 | volume= 134 | issue= 4 | pages= 1141-1142 | pmid=24202232 | doi=10.1038/jid.2013.464 | pmc=3961558 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24202232  }} </ref> <ref name="pmid26455063">{{cite journal| author=Vidal CI| title=Overview of Alopecia: A Dermatopathologist's Perspective. | journal=Mo Med | year= 2015 | volume= 112 | issue= 4 | pages= 308-12 | pmid=26455063 | doi= | pmc=6170065 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks &id=26455063 }} </ref> <ref name="pmid26244028">{{cite journal| author=Villasante Fricke AC, Miteva M| title=Epidemiology and burden of alopecia areata: a systematic review. | journal=Clin Cosmet Investig Dermatol | year= 2015 | volume= 8 | issue=  | pages= 397-403 | pmid=26244028 | doi=10.2147/CCID.S53985 | pmc=4521674 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26244028  }} </ref> <ref name="pmid21616562">{{cite journal| author=Chu SY, Chen YJ, Tseng WC, Lin MW, Chen TJ, Hwang CY | display-authors=etal| title=Comorbidity profiles among patients with alopecia areata: the importance of onset age, a nationwide population-based study. | journal=J Am Acad Dermatol | year= 2011 | volume= 65 | issue= 5 | pages= 949-56 | pmid=21616562 | doi=10.1016/j.jaad.2010.08.032 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21616562  }} </ref> <ref name="pmid26499292">Chen CH, Wang KH, Lin HC, Chung SD (2016) [https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&retmode=ref&cmd=prlinks&id=26499292 Follow-up study on the relationship between alopecia areata and risk of autoimmune diseases.] ''J Dermatol'' 43 (2):228-9. [http://dx.doi.org/10.1111/1346-8138.13165 DOI:10.1111/1346-8138.13165] PMID: [https://pubmed.gov/26499292 26499292]</ref>
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* It presents with round patches of total hair loss with retained follicular ostia with the beard and scalp being the most frequently affected areas.<ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> It occurs most often before the age of 30 and is evenly distributed between the sexes<ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref>.
* It presents with round patches of total hair loss with retained follicular ostia with the beard and scalp being the most frequently affected areas.  
 
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* [[Alopecia areata]] has a [[prevalence]] of 100-200 per 100,000 individuals, and a risk of about 2% over an individual's life. The mean age for diagnosis of [[alopecia areata]] is about 32 years in males and 36 years in females.
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* Close observation reveals the characteristic exclamation mark hairs. A [[hair pull test]] followed by [[trichogram]] shows telogen and pencil point shafts.  
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* Close observation reveals the characteristic exclamation mark hairs.<ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> A hair pull test followed by trichogram shows telogen and pencil point shafts <ref name="pmid26455063">{{cite journal| author=Vidal CI| title=Overview of Alopecia: A Dermatopathologist's Perspective. | journal=Mo Med | year= 2015 | volume= 112 | issue= 4 | pages= 308-12 | pmid=26455063 | doi= | pmc=6170065 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks &id=26455063 }} </ref>. It is associated with several autoimmune diseases including thyroid disease, rheumatoid arthritis, inflammatory bowel disease, and vitiligo. <ref name="pmid26244028">{{cite journal| author=Villasante Fricke AC, Miteva M| title=Epidemiology and burden of alopecia areata: a systematic review. | journal=Clin Cosmet Investig Dermatol | year= 2015 | volume= 8 | issue=  | pages= 397-403 | pmid=26244028 | doi=10.2147/CCID.S53985 | pmc=4521674 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26244028  }} </ref> <ref name="pmid21616562">{{cite journal| author=Chu SY, Chen YJ, Tseng WC, Lin MW, Chen TJ, Hwang CY | display-authors=etal| title=Comorbidity profiles among patients with alopecia areata: the importance of onset age, a nationwide population-based study. | journal=J Am Acad Dermatol | year= 2011 | volume= 65 | issue= 5 | pages= 949-56 | pmid=21616562 | doi=10.1016/j.jaad.2010.08.032 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21616562  }} </ref> <ref name="pmid26499292">Chen CH, Wang KH, Lin HC, Chung SD (2016) [https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&retmode=ref&cmd=prlinks&id=26499292 Follow-up study on the relationship between alopecia areata and risk of autoimmune diseases.] ''J Dermatol'' 43 (2):228-9. [http://dx.doi.org/10.1111/1346-8138.13165 DOI:10.1111/1346-8138.13165] PMID: [https://pubmed.gov/26499292 26499292]</ref>
* It is associated with several autoimmune diseases including [[thyroid disease]], [[rheumatoid arthritis]], [[inflammatory bowel disease]], and [[vitiligo]].
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| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Telogen Effluvium
| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Telogen Effluvium <ref>Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]</ref> <ref name="pmid30237729">{{cite journal| author=Sant'Anna Addor FA, Donato LC, Melo CSA| title=Comparative evaluation between two nutritional supplements in the improvement of telogen effluvium. | journal=Clin Cosmet Investig Dermatol | year= 2018 | volume= 11 | issue=  | pages= 431-436 | pmid=30237729 | doi=10.2147/CCID.S173082 | pmc=6136400 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=30237729  }} </ref> <ref name="pmid26455063">{{cite journal| author=Vidal CI| title=Overview of Alopecia: A Dermatopathologist's Perspective. | journal=Mo Med | year= 2015 | volume= 112 | issue= 4 | pages= 308-12 | pmid=26455063 | doi= | pmc=6170065 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26455063  }} </ref>
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* There is a massive amount of hair shedding which could be an acute self-limiting form triggered by stressors such as crash diets, childbirth, febrile illness or psychological stress or it could be chronic and present in association with female pattern hair loss. <ref>Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]</ref>
* There is a massive amount of hair shedding that is triggered by physiologic or psychologic stress.  
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* Hair pull test followed by trichogram reveals numerous clubbed-shaped hairs; telogen count must exceed 20% for diagnosis. <ref name="pmid26455063">{{cite journal| author=Vidal CI| title=Overview of Alopecia: A Dermatopathologist's Perspective. | journal=Mo Med | year= 2015 | volume= 112 | issue= 4 | pages= 308-12 | pmid=26455063 | doi= | pmc=6170065 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26455063  }} </ref>
* Although considered to be a relatively common condition, the precise [[prevalence]] of [[telogen effluvium]] remains unknown.  However, it is believed that it is more commonly seen in females than in males
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* [[Hair pull test]] followed by [[trichogram]] reveals numerous clubbed-shaped hairs; telogen count must exceed 20% for diagnosis.  
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* It could be an acute self-limiting form triggered by stressors such as crash diets, childbirth, febrile illness, or psychological stress.
* It may be chronic and present in association with female pattern hair loss.
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| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Anagen Effluvium
| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Anagen Effluvium <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref>
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* There is diffuse hair loss and it is characterized by hair breakage that takes place in the anagen phase.
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* Associated with exposure to [[radiation]], as in [[radiotherapy]] and [[cancer chemotherapy]].
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* Associated with exposure to radiation, as in radiotherapy and cancer chemotherapy. There is diffuse hair loss and it is characterized by hair breakage that takes place in the anagen phase. <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref>
* [[Trichoscopy]] would reveal the characteristic narrowing, fractured hair shafts with an absence of bulbs.  
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* Trichoscopy would reveal the characteristic narrowing, fractured hair shafts with an absence of bulbs. <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref>
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| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Trichotillomania
| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Trichotillomania <ref>Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]</ref> <ref name="pmid1938977">{{cite journal| author=Christenson GA, Pyle RL, Mitchell JE| title=Estimated lifetime prevalence of trichotillomania in college students. | journal=J Clin Psychiatry | year= 1991 | volume= 52 | issue= 10 | pages= 415-7 | pmid=1938977 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=1938977  }} </ref> <ref name="pmid7559316">{{cite journal| author=King RA, Zohar AH, Ratzoni G, Binder M, Kron S, Dycian A | display-authors=etal| title=An epidemiological study of [[trichotillomania]] in Israeli adolescents. | journal=J Am Acad Child Adolesc Psychiatry | year= 1995 | volume= 34 | issue= 9 | pages= 1212-5 | pmid=7559316 | doi=10.1097/00004583-199509000-00019 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=7559316  }} </ref> <ref name="pmid19926375">{{cite journal| author=Duke DC, Keeley ML, Geffken GR, Storch EA| title=Trichotillomania: A current review. | journal=Clin Psychol Rev | year= 2010 | volume= 30 | issue= 2 | pages= 181-93 | pmid=19926375 | doi=10.1016/j.cpr.2009.10.008 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19926375  }} </ref> <ref name="pmid20946585">{{cite journal| author=Quercetani R, Rebora AE, Fedi MC, Carelli G, Mei S, Chelli A | display-authors=etal| title=Patients with profuse hair shedding may reveal anagen hair dystrophy: a diagnostic clue of alopecia areata incognita. | journal=J Eur Acad Dermatol Venereol | year= 2011 | volume= 25 | issue= 7 | pages= 808-10 | pmid=20946585 | doi=10.1111/j.1468-3083.2010.03869.x | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=20946585  }} </ref> <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> <ref>Habif TP 2010. Hair diseases. In Clinical dermatology, 5th ed Mosby, Maryland Heights, MO [Google Scholar]</ref> <ref>Otberg N, Shapiro J 2012. Hair growth disorders. In Fitzpatrick’s dermatology in general medicine, 8th ed (ed. Goldsmith LA, et al.). McGraw-Hill, New York [Google Scholar]</ref>
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* Presents with uneven broken hairs in the most frequently selected areas which are the scalp, eyebrows, eyelashes, body hair, facial hair, and pubic hair.
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* It occurs as a result of a lack of impulse control in which an individual pulls on hair. Scalp inspection reveals uneven patches of hair loss with broken hairs that remain well attached to the skin. <ref>Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]</ref> The most frequently selected areas are scalp, eyebrows, eyelashes, body hair, facial hair, and pubic hair. It usually starts around the age of 12–13 years <ref name="pmid20946585">{{cite journal| author=Quercetani R, Rebora AE, Fedi MC, Carelli G, Mei S, Chelli A | display-authors=etal| title=Patients with profuse hair shedding may reveal anagen hair dystrophy: a diagnostic clue of alopecia areata incognita. | journal=J Eur Acad Dermatol Venereol | year= 2011 | volume= 25 | issue= 7 | pages= 808-10 | pmid=20946585 | doi=10.1111/j.1468-3083.2010.03869.x | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=20946585  }} </ref> and is more common in males during the childhood years while it is more common in females in the adult years. <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref>
* Based on the limited studies that have been done to determine the [[prevalence]] of [[trichotillomania]] among U.S. university students, Israeli adolescents, and older adults within the same community, the [[prevalence]] was shown to be between 500 per 100,000 to 2000 per 100,000.
* It usually starts around the age of 12–13 years
* It is more common in males during the childhood years while it is more common in females in the adult years.
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* Scalp inspection reveals uneven patches of hair loss with broken hairs that remain well attached to the skin. <ref>Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]</ref>. A characteristic finding that distinguishes trichotillomania from alopecia areata is that the affected areas are not totally devoid of hair shafts. <ref>Habif TP 2010. Hair diseases. In Clinical dermatology, 5th ed Mosby, Maryland Heights, MO [Google Scholar]</ref> <ref>Otberg N, Shapiro J 2012. Hair growth disorders. In Fitzpatrick’s dermatology in general medicine, 8th ed (ed. Goldsmith LA, et al.). McGraw-Hill, New York [Google Scholar]</ref>
* Scalp inspection reveals uneven patches of hair loss with broken hairs that remain well attached to the skin.
* A characteristic finding that distinguishes [[trichotillomania]] from [[alopecia areata]] is that the affected areas are not totally devoid of hair shafts.
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* It occurs as a result of a lack of impulse control in which an individual pulls on hair.
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| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Traction Alopecia
| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Traction Alopecia <ref>Otberg N, Shapiro J 2012. Hair growth disorders. In Fitzpatrick’s dermatology in general medicine, 8th ed (ed. Goldsmith LA, et al.). McGraw-Hill, New York [Google Scholar]</ref> <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> <ref name="pmid15113284">{{cite journal| author=Callender VD, McMichael AJ, Cohen GF| title=Medical and surgical therapies for alopecias in black women. | journal=Dermatol Ther | year= 2004 | volume= 17 | issue= 2 | pages= 164-76 | pmid=15113284 | doi=10.1111/j.1396-0296.2004.04017.x | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15113284  }} </ref> <ref name="pmid29265342">{{cite journal| author=Aguado Lobo M, Jiménez-Reyes J| title=Traction alopecia. | journal=Int J Dermatol | year= 2018 | volume= 57 | issue= 2 | pages= 231-232 | pmid=29265342 | doi=10.1111/ijd.13846 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi? dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=29265342  }} </ref> <ref name="pmid15113284">{{cite journal| author=Callender VD, McMichael AJ, Cohen GF| title=Medical and surgical therapies for alopecias in black women. | journal=Dermatol Ther | year= 2004 | volume= 17 | issue= 2 | pages= 164-76 | pmid=15113284 | doi=10.1111/j.1396-0296.2004.04017.x | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15113284  }} </ref>
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* It is due to from tension on hair follicles for a prolonged period of time caused from tight hairstyles including braids and ponytails. Black populations are more prone due to widespread use of tight hairstyles. <ref>Otberg N, Shapiro J 2012. Hair growth disorders. In Fitzpatrick’s dermatology in general medicine, 8th ed (ed. Goldsmith LA, et al.). McGraw-Hill, New York [Google Scholar]</ref> <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> <ref name="pmid15113284">{{cite journal| author=Callender VD, McMichael AJ, Cohen GF| title=Medical and surgical therapies for alopecias in black women. | journal=Dermatol Ther | year= 2004 | volume= 17 | issue= 2 | pages= 164-76 | pmid=15113284 | doi=10.1111/j.1396-0296.2004.04017.x | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15113284  }} </ref>
* Hair loss at regions of the scalp exposed to tension on hair follicles for a prolonged period of time in people who make tight hairstyles.  
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* Black populations are most at risk. <ref>Habif TP 2010. Hair diseases. In Clinical dermatology, 5th ed Mosby, Maryland Heights, MO [Google Scholar]</ref> With early detection and switching to more loose hairstyles, it is reversible but with prolonged tension on the scalp destruction of the hair follicles will occur making the condition irreversible. <ref name="pmid15113284">{{cite journal| author=Callender VD, McMichael AJ, Cohen GF| title=Medical and surgical therapies for alopecias in black women. | journal=Dermatol Ther | year= 2004 | volume= 17 | issue= 2 | pages= 164-76 | pmid=15113284 | doi=10.1111/j.1396-0296.2004.04017.x | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15113284  }} </ref>
* [[Traction alopecia]] is more commonly seen among black populations with females being affected more often than males at a rate of about 31,000-32,000 per 100,000 women compared to about 2,300 per 100,000 men.
* [[Traction alopecia]] is seen in about 18,000 per 100,000 girls between the ages of 5.4 to 14.3 years based on a study of African-American girls.
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* Mostly a clinical diagnosis based on hair loss at areas of the scalp where tension on the hair is highest.
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* Early detection and switching to more loose hairstyles may reverse the condition, however, with prolonged tension on the scalp destruction of the hair follicles will occur, causing the condition to become irreversible.  
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| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Chronic Cutaneous Lupus Erythematosus
| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Chronic Cutaneous Lupus Erythematosus <ref>Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]</ref> <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> 
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* Presents with an area with hair loss that gradually converts into a scaly, thickened papules then into poorly-defined, variably-shaped plaques with atrophy, follicular plugging, telangiectasia and depigmentation. <ref>Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]</ref> Black populations tend to have more serious disease. <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> 
* Presents with an area with hair loss that gradually converts into scaly, thickened papules then into poorly-defined, variably-shaped plaques with atrophy, follicular plugging, telangiectasia, and depigmentation.
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* Histological analysis after a hair pull test reveals a higher anagen count during active disease. Direct immunofluorescence may reveal granular C3 and IgG at the dermo-epidermal boundary which is found in greater than 70% of cases. <ref>Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]</ref>
* Black populations tend to have more serious disease.
* [[Cutaneous lupus erythematosus]] is more common in males than in females, with a ratio of about 59.4 per 100,000 versus 1.6 per 100,000.
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* [[Histological analysis]] after a [[hair pull test]] reveals a higher anagen count during active disease.
* [[Direct immunofluorescence]] may reveal granular [[C3]] and [[IgG]] at the dermo-epidermal boundary which is found in greater than 70% of cases.
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| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Tinea Capitis
| style="padding: 5px 5px; background: #DCDCDC; font-weight: bold; text-align:center;" |Tinea Capitis <ref name="pmid30725594">{{cite journal| author=| title=StatPearls | journal= | year= 2020 | volume=  | issue=  | pages=  | pmid=30725594 | doi= | pmc= | url= }} </ref> <ref name="pmid12431130">{{cite journal| author=Pomeranz AJ, Sabnis SS| title=Tinea capitis: epidemiology, diagnosis and management strategies. | journal=Paediatr Drugs | year= 2002 | volume= 4 | issue= 12 | pages= 779-83 | pmid=12431130 | doi=10.2165/00128072-200204120-00002 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=12431130  }} </ref> <ref name="pmid19502982">{{cite journal| author=Kos L, Conlon J| title=An update on alopecia areata. | journal=Curr Opin Pediatr | year= 2009 | volume= 21 | issue= 4 | pages= 475-80 | pmid=19502982 | doi=10.1097/MOP.0b013e32832db986 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19502982  }} </ref> <ref>Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]</ref> <ref name="pmid22972730">{{cite journal| author=Ponka D, Baddar F| title=Wood lamp examination. | journal=Can Fam Physician | year= 2012 | volume= 58 | issue= 9 | pages= 976 | pmid=22972730 | doi= | pmc=3440273 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=22972730  }} </ref> <ref name="pmid26455063">{{cite journal| author=Vidal CI| title=Overview of Alopecia: A Dermatopathologist's Perspective. | journal=Mo Med | year= 2015 | volume= 112 | issue= 4 | pages= 308-12 | pmid=26455063 | doi= | pmc=6170065 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26455063  }} </ref>
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* Presents in diverse ways such as ordinary scaling without any obvious hair loss which is considered to be a seborrheic form, a crusted or [[pustular]] form that may be localized or diffuse, a ‘black dot’ type that is characterized by tiny black dots within regions of [[alopecia]], an inflammatory mass called [[kerion]], and a round, bald, scaly patch where the follicular ostia are filled with keratinous debris.
* A unique feature of [[tinea capita]]s is the presence of post-auricular and cervical [[lymphadenopathy]].
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* It is more common in the pediatric population.
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| style="padding: 5px 5px; background: #F5F5F5;" |
* Presents in diverse ways such as ordinary scaling without any obvious hair loss which is considered to be a seborrheic form, a crusted or pustular form that may be localized or diffuse, a ‘black dot’ type that is characterized by tiny black dots within regions of alopecia, an inflammatory mass called kerion,  <ref name="pmid12431130">{{cite journal| author=Pomeranz AJ, Sabnis SS| title=Tinea capitis: epidemiology, diagnosis and management strategies. | journal=Paediatr Drugs | year= 2002 | volume= 4 | issue= 12 | pages= 779-83 | pmid=12431130 | doi=10.2165/00128072-200204120-00002 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=12431130  }} </ref> and a round, bald, scaly patch where the follicular ostia are filled with keratinous debris. <ref name="pmid19502982">{{cite journal| author=Kos L, Conlon J| title=An update on alopecia areata. | journal=Curr Opin Pediatr | year= 2009 | volume= 21 | issue= 4 | pages= 475-80 | pmid=19502982 | doi=10.1097/MOP.0b013e32832db986 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19502982 }} </ref>
* [[Potassium hydroxide]] preparation can be added to skin scrapings of affected areas in order to diagnose the condition. <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages= | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533 }} </ref>
* Wood's light can also be used in diagnosis as majority of [[Microsporum]] spp will appear bluish-green, occasionally dull yellow (Microsporum gypseum) and dull blue ([[Trichophyton]] schoenleinii).
| style="padding: 5px 5px; background: #F5F5F5;" |
| style="padding: 5px 5px; background: #F5F5F5;" |
* It is more common in the pediatric population. <ref name="pmid26455063">{{cite journal| author=Vidal CI| title=Overview of Alopecia: A Dermatopathologist's Perspective. | journal=Mo Med | year= 2015 | volume= 112 | issue= 4 | pages= 308-12 | pmid=26455063 | doi= | pmc=6170065 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26455063  }} </ref> A unique feature of tinea capitis is the presence of post-auricular and cervical lymphadenopathy. <ref>Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]</ref> Potassium hydroxide preparation can be added to skin scrapings of affected areas in order to diagnose the condition. <ref name="pmid24591533">{{cite journal| author=Qi J, Garza LA| title=An overview of alopecias. | journal=Cold Spring Harb Perspect Med | year= 2014 | volume= 4 | issue= 3 | pages=  | pmid=24591533 | doi=10.1101/cshperspect.a013615 | pmc=3935391 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24591533  }} </ref> Wood's light can also be used in diagnosis as majority of Microsporum spp will appear bluish-green, occasionally dull yellow (Microsporum gypseum) and dull blue (Trichophyton schoenleinii).  However,  in the U.S., under 5% of cases will show fluorescence. <ref name="pmid22972730">{{cite journal| author=Ponka D, Baddar F| title=Wood lamp examination. | journal=Can Fam Physician | year= 2012 | volume= 58 | issue= 9 | pages= 976 | pmid=22972730 | doi= | pmc=3440273 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=22972730  }} </ref> A possible complication of tinea capitis is [[kerion]], an abscess in the [[scalp]], or [[favus]], another inflammatory form in which there is a honeycomb destruction of the hair shaft.  Both are severe forms of the disease and can cause permanent scarring.<ref name="pmid30725594">{{cite journal| author=| title=StatPearls | journal= | year= 2020 | volume=  | issue=  | pages=  | pmid=30725594 | doi= | pmc= | url= }} </ref>
* In the U.S., under 5% of cases will show [[fluorescence]].  
* Possible complications of [[tinea capita]]s are [[kerion]], an [[abscess]] in the scalp, or [[favus]], another inflammatory form in which there is honeycomb destruction of the hair shaft.  Both are severe forms of the disease and can cause permanent scarring.
 
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*[[Sarcoidosis]]
*[[Sarcoidosis]]
*[[Scleroderma]]
*[[Scleroderma]]
*[[Systemic Lupus Erythematosus]] <ref name="pmid32699719">{{cite journal| author=Forouzan P, Cohen PR| title=Systemic Lupus Erythematosus Presenting as Alopecia Areata. | journal=Cureus | year= 2020 | volume= 12 | issue= 6 | pages= e8724 | pmid=32699719 | doi=10.7759/cureus.8724 | pmc=7372242 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=32699719  }} </ref>, [[dermatomyositis]] <ref name="pmid10615903">{{cite journal| author=Callen JP| title=Dermatomyositis. | journal=Lancet | year= 2000 | volume= 355 | issue= 9197 | pages= 53-7 | pmid=10615903 | doi=10.1016/S0140-6736(99)05157-0 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=10615903  }} </ref>
*[[Systemic Lupus Erythematosus]] <ref name="pmid32699719">{{cite journal| author=Forouzan P, Cohen PR| title=Systemic Lupus Erythematosus Presenting as Alopecia Areata. | journal=Cureus | year= 2020 | volume= 12 | issue= 6 | pages= e8724 | pmid=32699719 | doi=10.7759/cureus.8724 | pmc=7372242 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmedomyositis. | journal=Lancet | year= 2000 | volume= 355 | issue= 9197 | pages= 53-7 | pmid=10615903 | doi=10.1016/S0140-6736(99)05157-0 | pmc= | url=https://&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=32699719  }} </ref>, [[dermatomyositis]] <ref name="pmid10615903">{{cite journal| author=Callen JP| title=Dermatwww.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=10615903  }} </ref>


===Miscellaneous===
===Miscellaneous===

Latest revision as of 10:37, 25 May 2021

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Ogechukwu Hannah Nnabude, MD

Overview

There is a very wide list of diseases and conditions that can lead to alopecia. Proper history taking and physical examination, along with laboratory, microbiology, and in some cases, imaging studies, are helpful in narrowing down the diagnosis. Alopecia can be caused by many different diseases. Some of the most well known and common causes are: androgenetic alopecia, alopecia areata, telogen effluvium, anagen effluvium, traction alopecia, and trichotillomania. Endocrine disorders such as hypothyroidism, hypoparathyroidism and Cushing's syndrome as well as malnutrition and medications are also possible causes of alopecia.

Differentiating Alopecia from Other Diseases
Disease/Condition Clinical presentation Demographics/History Diagnosis Other notes
Androgenetic Alopecia [1] [2] [3]
  • Male pattern: The frontal hairline is thinner, hair loss occurs at the crown of the scalp, hair recession is seen at the temporal aspects of the scalp; Female pattern: Hair loss occurs at the crown of the scalp, however, the frontal hairline remains preserved.
  • Androgenetic alopecia is believed to have a worldwide prevalence of about 50,000 per 100,000 men and 15,000 per 100,000 women with post-menopausal women making up the majority.
  • Diagnosis is mostly clinical and is based on the pattern and absence of other explanations.
  • Unlike in telogen effluvium, hair pull test shows a less than 20% telogen count.
  • It is the most common cause of hair loss.
Alopecia Areata [1] [4] [5] [6] [3] [7] [8] [9]
  • It presents with round patches of total hair loss with retained follicular ostia with the beard and scalp being the most frequently affected areas.
  • Alopecia areata has a prevalence of 100-200 per 100,000 individuals, and a risk of about 2% over an individual's life. The mean age for diagnosis of alopecia areata is about 32 years in males and 36 years in females.
  • Close observation reveals the characteristic exclamation mark hairs. A hair pull test followed by trichogram shows telogen and pencil point shafts.
Telogen Effluvium [10] [11] [3]
  • There is a massive amount of hair shedding that is triggered by physiologic or psychologic stress.
  • Although considered to be a relatively common condition, the precise prevalence of telogen effluvium remains unknown. However, it is believed that it is more commonly seen in females than in males
  • Hair pull test followed by trichogram reveals numerous clubbed-shaped hairs; telogen count must exceed 20% for diagnosis.
  • It could be an acute self-limiting form triggered by stressors such as crash diets, childbirth, febrile illness, or psychological stress.
  • It may be chronic and present in association with female pattern hair loss.
Anagen Effluvium [1]
  • There is diffuse hair loss and it is characterized by hair breakage that takes place in the anagen phase.
  • Trichoscopy would reveal the characteristic narrowing, fractured hair shafts with an absence of bulbs.

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Trichotillomania [12] [13] [14] [15] [16] [1] [17] [18]
  • Presents with uneven broken hairs in the most frequently selected areas which are the scalp, eyebrows, eyelashes, body hair, facial hair, and pubic hair.
  • Based on the limited studies that have been done to determine the prevalence of trichotillomania among U.S. university students, Israeli adolescents, and older adults within the same community, the prevalence was shown to be between 500 per 100,000 to 2000 per 100,000.
  • It usually starts around the age of 12–13 years
  • It is more common in males during the childhood years while it is more common in females in the adult years.
  • Scalp inspection reveals uneven patches of hair loss with broken hairs that remain well attached to the skin.
  • A characteristic finding that distinguishes trichotillomania from alopecia areata is that the affected areas are not totally devoid of hair shafts.
  • It occurs as a result of a lack of impulse control in which an individual pulls on hair.
Traction Alopecia [19] [1] [20] [21] [20]
  • Hair loss at regions of the scalp exposed to tension on hair follicles for a prolonged period of time in people who make tight hairstyles.
  • Traction alopecia is more commonly seen among black populations with females being affected more often than males at a rate of about 31,000-32,000 per 100,000 women compared to about 2,300 per 100,000 men.
  • Traction alopecia is seen in about 18,000 per 100,000 girls between the ages of 5.4 to 14.3 years based on a study of African-American girls.
  • Mostly a clinical diagnosis based on hair loss at areas of the scalp where tension on the hair is highest.
  • Early detection and switching to more loose hairstyles may reverse the condition, however, with prolonged tension on the scalp destruction of the hair follicles will occur, causing the condition to become irreversible.
Chronic Cutaneous Lupus Erythematosus [22] [1]
  • Presents with an area with hair loss that gradually converts into scaly, thickened papules then into poorly-defined, variably-shaped plaques with atrophy, follicular plugging, telangiectasia, and depigmentation.
  • Black populations tend to have more serious disease.
  • Cutaneous lupus erythematosus is more common in males than in females, with a ratio of about 59.4 per 100,000 versus 1.6 per 100,000.

-

Tinea Capitis [23] [24] [25] [26] [27] [3]
  • Presents in diverse ways such as ordinary scaling without any obvious hair loss which is considered to be a seborrheic form, a crusted or pustular form that may be localized or diffuse, a ‘black dot’ type that is characterized by tiny black dots within regions of alopecia, an inflammatory mass called kerion, and a round, bald, scaly patch where the follicular ostia are filled with keratinous debris.
  • A unique feature of tinea capitas is the presence of post-auricular and cervical lymphadenopathy.
  • It is more common in the pediatric population.
  • Potassium hydroxide preparation can be added to skin scrapings of affected areas in order to diagnose the condition. [1]
  • Wood's light can also be used in diagnosis as majority of Microsporum spp will appear bluish-green, occasionally dull yellow (Microsporum gypseum) and dull blue (Trichophyton schoenleinii).
  • In the U.S., under 5% of cases will show fluorescence.
  • Possible complications of tinea capitas are kerion, an abscess in the scalp, or favus, another inflammatory form in which there is honeycomb destruction of the hair shaft. Both are severe forms of the disease and can cause permanent scarring.


The following lists the complete differential diagnosis of Alopecia:

Non-Scarring Alopecia

Scarring Alopecia

Miscellaneous

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Qi J, Garza LA (2014). "An overview of alopecias". Cold Spring Harb Perspect Med. 4 (3). doi:10.1101/cshperspect.a013615. PMC 3935391. PMID 24591533.
  2. ↑ Rinaldi F, Marzani B, Pinto D, Sorbellini E (2019). "Randomized controlled trial on a PRP-like cosmetic, biomimetic peptides based, for the treatment of alopecia areata". J Dermatolog Treat. 30 (6): 588–593. doi:10.1080/09546634.2018.1544405. PMID 30513014.
  3. ↑ 3.0 3.1 3.2 3.3 Vidal CI (2015). "Overview of Alopecia: A Dermatopathologist's Perspective". Mo Med. 112 (4): 308–12. PMC 6170065. PMID 26455063.
  4. ↑ Strazzulla LC, Wang EHC, Avila L, Lo Sicco K, Brinster N, Christiano AM; et al. (2018). "Alopecia areata: Disease characteristics, clinical evaluation, and new perspectives on pathogenesis". J Am Acad Dermatol. 78 (1): 1–12. doi:10.1016/j.jaad.2017.04.1141. PMID 29241771.
  5. ↑ Safavi KH, Muller SA, Suman VJ, Moshell AN, Melton LJ (1995). "Incidence of alopecia areata in Olmsted County, Minnesota, 1975 through 1989". Mayo Clin Proc. 70 (7): 628–33. doi:10.4065/70.7.628. PMID 7791384.
  6. ↑ Mirzoyev SA, Schrum AG, Davis MDP, Torgerson RR (2014). "Lifetime incidence risk of alopecia areata estimated at 2.1% by Rochester Epidemiology Project, 1990-2009". J Invest Dermatol. 134 (4): 1141–1142. doi:10.1038/jid.2013.464. PMC 3961558. PMID 24202232.
  7. ↑ Villasante Fricke AC, Miteva M (2015). "Epidemiology and burden of alopecia areata: a systematic review". Clin Cosmet Investig Dermatol. 8: 397–403. doi:10.2147/CCID.S53985. PMC 4521674. PMID 26244028.
  8. ↑ Chu SY, Chen YJ, Tseng WC, Lin MW, Chen TJ, Hwang CY; et al. (2011). "Comorbidity profiles among patients with alopecia areata: the importance of onset age, a nationwide population-based study". J Am Acad Dermatol. 65 (5): 949–56. doi:10.1016/j.jaad.2010.08.032. PMID 21616562.
  9. ↑ Chen CH, Wang KH, Lin HC, Chung SD (2016) Follow-up study on the relationship between alopecia areata and risk of autoimmune diseases. J Dermatol 43 (2):228-9. DOI:10.1111/1346-8138.13165 PMID: 26499292
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  14. ↑ King RA, Zohar AH, Ratzoni G, Binder M, Kron S, Dycian A; et al. (1995). "An epidemiological study of [[trichotillomania]] in Israeli adolescents". J Am Acad Child Adolesc Psychiatry. 34 (9): 1212–5. doi:10.1097/00004583-199509000-00019. PMID 7559316. URL–wikilink conflict (help)
  15. ↑ Duke DC, Keeley ML, Geffken GR, Storch EA (2010). "Trichotillomania: A current review". Clin Psychol Rev. 30 (2): 181–93. doi:10.1016/j.cpr.2009.10.008. PMID 19926375.
  16. ↑ Quercetani R, Rebora AE, Fedi MC, Carelli G, Mei S, Chelli A; et al. (2011). "Patients with profuse hair shedding may reveal anagen hair dystrophy: a diagnostic clue of alopecia areata incognita". J Eur Acad Dermatol Venereol. 25 (7): 808–10. doi:10.1111/j.1468-3083.2010.03869.x. PMID 20946585.
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  20. ↑ 20.0 20.1 Callender VD, McMichael AJ, Cohen GF (2004). "Medical and surgical therapies for alopecias in black women". Dermatol Ther. 17 (2): 164–76. doi:10.1111/j.1396-0296.2004.04017.x. PMID 15113284.
  21. ↑ Aguado Lobo M, Jiménez-Reyes J (2018). dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=29265342 "Traction alopecia" Check |url= value (help). Int J Dermatol. 57 (2): 231–232. doi:10.1111/ijd.13846. PMID 29265342.
  22. ↑ Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]
  23. ↑ "StatPearls". 2020. PMID 30725594.
  24. ↑ Pomeranz AJ, Sabnis SS (2002). "Tinea capitis: epidemiology, diagnosis and management strategies". Paediatr Drugs. 4 (12): 779–83. doi:10.2165/00128072-200204120-00002. PMID 12431130.
  25. ↑ Kos L, Conlon J (2009). "An update on alopecia areata". Curr Opin Pediatr. 21 (4): 475–80. doi:10.1097/MOP.0b013e32832db986. PMID 19502982.
  26. ↑ Sperling LC, Cowper SE, Knopp EA. An atlas of hair pathology with clinical correlations. 2. Informa Healthcare; 2014. [Google Scholar]
  27. ↑ Ponka D, Baddar F (2012). "Wood lamp examination". Can Fam Physician. 58 (9): 976. PMC 3440273. PMID 22972730.
  28. ↑ Watras MM, Patel JP, Arya R (2016). "Traditional Anticoagulants and Hair Loss: A Role for Direct Oral Anticoagulants? A Review of the Literature". Drugs Real World Outcomes. 3 (1): 1–6. doi:10.1007/s40801-015-0056-z. PMC 4819463. PMID 27747798.
  29. ↑ Thomson SR, Mamulpet V, Adiga S (2017). "Sodium Valproate Induced Alopecia: A Case Series". J Clin Diagn Res. 11 (9): FR01–FR02. doi:10.7860/JCDR/2017/28564.10658. PMC 5713753. PMID 29207731.
  30. ↑ HOLOWACH J, SANDEN HV (1960). "Alopecia as a side effect of treatment of epilepsy with trimethadione. Report of two cases". N Engl J Med. 263: 1187. doi:10.1056/NEJM196012082632308. PMID 13715510.
  31. ↑ Shelley ED, Shelley WB (1985). "Alopecia and drug eruption of the scalp associated with a new beta-blocker, nadolol". Cutis. 35 (2): 148–9. PMID 3979099.
  32. ↑ Forouzan P, Cohen PR (2000). "Systemic Lupus Erythematosus Presenting as Alopecia Areata" Check |url= value (help). Lancet. 355 (9197): 53–7. doi:10.1016/S0140-6736(99)05157-0. PMID 10615903.
  33. ↑ Callen JP. "Dermatwww.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=10615903".
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