Nevus depigmentosus: Difference between revisions
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* The exact cause of nevus depigmentosus is still not clearly understood. A sporadic defect in the embryonic development has been suggested to be a causative factor.<ref>{{cite journal |pmid=1870914|title=Disorders of hypopigmentation in children |publisher=U.S. National Library of Medicine |year=1991 |last1=Pinto |first1=FJ |last2=Bolognia |first2=JL |volume=38 |issue=4 |pages=991–1017 |journal=Pediatric clinics of North America}}</ref> | * The exact cause of nevus depigmentosus is still not clearly understood. A sporadic defect in the embryonic development has been suggested to be a causative factor.<ref>{{cite journal |pmid=1870914|title=Disorders of hypopigmentation in children |publisher=U.S. National Library of Medicine |year=1991 |last1=Pinto |first1=FJ |last2=Bolognia |first2=JL |volume=38 |issue=4 |pages=991–1017 |journal=Pediatric clinics of North America}}</ref> | ||
* It has been described as "localised albinism", though this is incorrect. | * It has been described as "localised albinism", though this is incorrect. | ||
==Pathophysiology== | |||
* These hypopigmented spots result from abnormalities in the function of [[melanocytes]] which produce little pigment thereby resulting in [[:wikt:characteristic|characteristic]] white spots in skin.<ref name="nevus" /> | * These hypopigmented spots result from abnormalities in the function of [[melanocytes]] which produce little pigment thereby resulting in [[:wikt:characteristic|characteristic]] white spots in skin.<ref name="nevus" /> | ||
Revision as of 17:03, 26 June 2014
| Nevus depigmentosus | |
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| Man's chest with nevus depigmentosus. Notice the affected (white) area to the left of the nipple. |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Nevus depigmentosus or nevus achromicus[1] is a depigmentation problem in skin which can be easily differentiated from vitiligo. Although age factor has not much involvement in the nevus depigmentosus but in about 19% of the cases these are noted at birth. Their size may however grow in proportion to growth of the body. The distribution is also fairly stable and are nonprogressive hypopigmented patches.[2] Those with nevus depigmentosus may be prone to sunburn due to the lack of pigment, and the patient should use good sun protection.[3]
Sunscreen should be applied to all exposed skin, since reduced tanning of normal skin will decrease the contrast with hypopigmented skin.[3] Most patients with nevus depigmentosus do not pursue treatment for their lesion.[4] There is no way to repigment the skin.[4] If, however, the lesion is of cosmetic concern, camouflage makeup is effective.[4] If the lesion is small one could also consider excision.[4]
Causes
- The exact cause of nevus depigmentosus is still not clearly understood. A sporadic defect in the embryonic development has been suggested to be a causative factor.[5]
- It has been described as "localised albinism", though this is incorrect.
Pathophysiology
- These hypopigmented spots result from abnormalities in the function of melanocytes which produce little pigment thereby resulting in characteristic white spots in skin.[2]
Symptoms
- These are localized white spots on skin which may affect any area of the body, but these white spots are quite stable lesions.[2] In the majority of patients, the lesions are not completely achromic, but are hypopigmented and resemble splashed paint.[6]
- The individual lesions are permanent and there are no effective therapies for re-pigmenting this nevus.[6]
- If there is hair in an affected area, it is usually colourless or white.
Treatment
- Different therapeutic modalities have been attempted to repigment the lesions of nevus depigmentosus such as PUVA (psoralen + UVA treatment), excimer laser, and different grafting techniques.
- PUVA therapy has not been shown to be beneficial.[7]
- Successful repigmentation was reported in a single case with 14 sessions of excimer laser treatment.[8]* Though the repigmentation of nevus depigmentosus is possible by grafting techniques, the results are inconsistent and recurrence is possible. In consideration of the experience of other authors and us, the quality and retention of pigment are unpredictable.
- These factors need to be considered while consulting and offering any treatment to the patient of nevus depigmentosus.[9]
See also
References
- ↑ Lee HS, Chun YS, Hann SK (January 1999). "Nevus depigmentosus: clinical features and histopathologic characteristics in 67 patients". J. Am. Acad. Dermatol. 40 (1): 21–6. doi:10.1016/S0190-9622(99)70524-4. PMID 9922008.
- ↑ 2.0 2.1 2.2 Lee, H S (January 1999). "Nevus depigmentosus: clinical features and histopathologic characteristics in 67 patients". J Am Acad Dermatol. 40 (1): 21–26. doi:10.1016/S0190-9622(99)70524-4. PMID 9922008. Unknown parameter
|coauthors=ignored (help) - ↑ 3.0 3.1 J. Kwiatkowski, David. Tuberous Sclerosis Complex: Genes, Clinical Features and Therapeutics. p. 286. ISBN 978-3-527-32201-5.
- ↑ 4.0 4.1 4.2 4.3 J. Nordlund, James. The pigmentary system: physiology and pathphysiology. p. 651. ISBN 978-0-19-509861-7.
- ↑ Pinto, FJ; Bolognia, JL (1991). "Disorders of hypopigmentation in children". Pediatric clinics of North America. U.S. National Library of Medicine. 38 (4): 991–1017. PMID 1870914.
- ↑ 6.0 6.1 Clinical Pediatric Dermatology. p. 92. ISBN 978-81-312-1489-3.
|first1=missing|last1=in Authors list (help) - ↑ Berg M, Tarnowski W. Nevus pigmentosus. Arch Dermatol 1974;109:920.
- ↑ Kim DY, Lee KY, Park YK. Use of the 308-nm excimer laser for nevus depigmentosus: A promising treatment for either nevus depigmentosus or vitiligo. J Dermatol 2007;34:217-8.
- ↑ Template:Cite doi