Tinea nigra: Difference between revisions

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__NOTOC__
__NOTOC__
{{SI}}
{{Dermatophytosis}}
 
{{CMG}}; {{AE}} {{KS}}
{{CMG}}; {{AE}} {{KS}}
==Overview==
==Overview==


Line 22: Line 24:
===Physical Examination===
===Physical Examination===
====Skin====
====Skin====
=====Extremities=====
<gallery>
<gallery>
Image:Tinea nigra01.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra02.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra03.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra04.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra05.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra06.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra07.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra08.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra09.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra10.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra11.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra12.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra13.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra14.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra15.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra16.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra17.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra18.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra19.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra20.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra21.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra22.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra23.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra24.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra25.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra26.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra27.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra28.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra29.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra30.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra31.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra32.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra33.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra34.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra35.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra36.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra37.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra38.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra39.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra40.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>




Image:Tinea nigra41.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>




Image:Tinea nigra42.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>


Image:Tinea nigra43.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra44.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra45.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra46.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra47.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra48.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra49.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra50.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra51.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra52.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra53.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra54.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra55.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra56.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra57.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra58.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra59.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra60.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra61.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>
Image:Tinea nigra62.jpg|Tinea nigra. <SMALL><SMALL>''[http://www.atlasdermatologico.com.br/  Adapted from Dermatology Atlas.]''<ref name="Dermatology Atlas">{{Cite web | title = Dermatology Atlas | url = http://www.atlasdermatologico.com.br/}}</ref></SMALL></SMALL>




Line 33: Line 260:


</gallery>
</gallery>
==Differential diagnosis==
Tinea nigra must be differentiated from other diseases presenting with an erythmatous, scaly, annular and pruritic rash. The differentials include the following:
{| class="wikitable"
! align="center" style="background: #4479BA; color: #FFFFFF; " |Name of superficial infection
! align="center" style="background: #4479BA; color: #FFFFFF; " |Clinical presentation
! align="center" style="background: #4479BA; color: #FFFFFF; " |Extension to hair follicle
! align="center" style="background: #4479BA; color: #FFFFFF; " |Fungus(i)
! align="center" style="background: #4479BA; color: #FFFFFF; " |Systemic disease
! align="center" style="background: #4479BA; color: #FFFFFF; " |KOH preparations
! align="center" style="background: #4479BA; color: #FFFFFF; " |Morphology in tissue sections
|-
| colspan="1" rowspan="1" |Tinea or [[Ringworm Infection|ringworm]]
| colspan="1" rowspan="1" |Round lesions with [[Scaling skin|scaly]] border, accompanied by [[pruritis]] and burning
| colspan="1" rowspan="1" |Yes; when [[suppurative]] known as [[kerion]], when chronic known as [[Majocchi's granuloma]]
| colspan="1" rowspan="1" |Dermatophytes (''[[Epidermophyton]]'' spp., ''[[Trichophyton]]'' spp., ''[[Microsporum]]'' spp.)
| colspan="1" rowspan="1" |Very rare but can invade the [[dermis]] and [[Soft tissue|soft tissues]], causing [[Mycetoma|mycetomas]]
| colspan="1" rowspan="1" |[[Hyphae]] with or without septations
| colspan="1" rowspan="1" |[[Hyphae]] cannot be visualized in the [[keratin]] with [[H&E stain|H&E]], special stains are needed
|-
| colspan="1" rowspan="1" |[[Tinea versicolor]]
| colspan="1" rowspan="1" |Hypo and [[hyperpigmentation]] in patients with oily and sweaty skin, fine [[Scaling skin|scales]] when scratching
| colspan="1" rowspan="1" |Yes, known as ''Pityrosporum'' folliculits
| colspan="1" rowspan="1" |''[[Malassezia]]'' spp.
| colspan="1" rowspan="1" |Systemic infections may occur in [[Premature birth|premature]] [[neonates]] receiving [[parenteral]] nutrition and in other [[Immunosuppression|immunosuppressed]] [[Host (biology)|hosts]]
| colspan="1" rowspan="1" |[[Yeast|Yeasts]] and [[hyphae]] (“spaghetti and meat balls”)
| colspan="1" rowspan="1" |Faintly [[basophilic]] hyphae in the [[stratum corneum]]
|-
| colspan="1" rowspan="1" |[[Tinea nigra]]
| colspan="1" rowspan="1" |Brown to black [[macule]], usually on palms, with some scaling
| colspan="1" rowspan="1" |No
| colspan="1" rowspan="1" |''Phaeoannellomyces werneckii''
| colspan="1" rowspan="1" |Not described
| colspan="1" rowspan="1" |Darkly pigmented, septated, and branching [[hyphae]]
| colspan="1" rowspan="1" |Pigmented [[hyphae]] in the [[stratum corneum]]
|-
| colspan="1" rowspan="1" |[[White piedra]]
| colspan="1" rowspan="1" |Creamy-white, small, soft nodules in hair shafts
| colspan="1" rowspan="1" |No
| colspan="1" rowspan="1" |''[[Trichosporon]]'' spp.
| colspan="1" rowspan="1" |[[Immunosuppressed]] patients may have [[lung]] infiltrates, [[renal]] involvement, and [[fungemia]]
| colspan="1" rowspan="1" |Septate [[hyphae]] perpendicular to hair shaft
| colspan="1" rowspan="1" |Not used for diagnosis
|-
| colspan="1" rowspan="1" |[[Black piedra]]
| colspan="1" rowspan="1" |Hard dark nodules in hair shafts
| colspan="1" rowspan="1" |No
| colspan="1" rowspan="1" |''Piedraia hortae''
| colspan="1" rowspan="1" |Not described
| colspan="1" rowspan="1" |Collections of crescent ascospores surrounded by [[Pigmented lesions|pigmented]] [[hyphae]]
| colspan="1" rowspan="1" |Not used for diagnosis
|-
| colspan="1" rowspan="1" |[[Candidiasis|Superficial candidiasis]]
| colspan="1" rowspan="1" |[[Intertrigo]], chronic [[paronychia]], [[onychodystrophy]], [[cheilitis]]
| colspan="1" rowspan="1" |Yes
| colspan="1" rowspan="1" |''[[Candida]]'' spp.
| colspan="1" rowspan="1" |Yes, particularly in patients with [[AIDS]] and depending on the level of [[immunosuppression]]
| colspan="1" rowspan="1" |[[Yeast|Yeasts]], pseudohyphae may be observed
| colspan="1" rowspan="1" |[[Fungal]] elements may be seen through the biopsy, vascular invasion must be determined
|}


==Treatment==
==Treatment==

Latest revision as of 20:19, 25 August 2017

File:Hortaea-werneckii-fungus--causes-tinea-nigra.jpg
Micrograph of the fungus Hortaea werneckii, the causative agent of tinea nigra
Tinea nigra
ICD-10 B36.1
DiseasesDB 32450
eMedicine derm/890 

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Kiran Singh, M.D. [2]

Overview

Tinea nigra (also known as "superficial phaeohyphomycosis,"[1] and "Tinea nigra palmaris et plantaris"[1]) is a superficial fungal infection that causes dark brown to black painless patches on the palms of the hands and the soles of the feet.[2]:311

Causes

This infection is caused by the fungus formerly classified as Exophiala werneckii but more recently classified as Hortaea werneckii.[3]

The causative organism has also been described as Phaeoannellomyces werneckii.[4]

Diagnosis

Diagnosis of tinea nigra causing fungus is made on microscopic examination of skin scrapings, mixed with potassium hydroxide (KOH).[5] The KOH lyses the nonfungal debris.[5]

Physical Examination

Skin

Extremities

Differential diagnosis

Tinea nigra must be differentiated from other diseases presenting with an erythmatous, scaly, annular and pruritic rash. The differentials include the following:

Name of superficial infection Clinical presentation Extension to hair follicle Fungus(i) Systemic disease KOH preparations Morphology in tissue sections
Tinea or ringworm Round lesions with scaly border, accompanied by pruritis and burning Yes; when suppurative known as kerion, when chronic known as Majocchi's granuloma Dermatophytes (Epidermophyton spp., Trichophyton spp., Microsporum spp.) Very rare but can invade the dermis and soft tissues, causing mycetomas Hyphae with or without septations Hyphae cannot be visualized in the keratin with H&E, special stains are needed
Tinea versicolor Hypo and hyperpigmentation in patients with oily and sweaty skin, fine scales when scratching Yes, known as Pityrosporum folliculits Malassezia spp. Systemic infections may occur in premature neonates receiving parenteral nutrition and in other immunosuppressed hosts Yeasts and hyphae (“spaghetti and meat balls”) Faintly basophilic hyphae in the stratum corneum
Tinea nigra Brown to black macule, usually on palms, with some scaling No Phaeoannellomyces werneckii Not described Darkly pigmented, septated, and branching hyphae Pigmented hyphae in the stratum corneum
White piedra Creamy-white, small, soft nodules in hair shafts No Trichosporon spp. Immunosuppressed patients may have lung infiltrates, renal involvement, and fungemia Septate hyphae perpendicular to hair shaft Not used for diagnosis
Black piedra Hard dark nodules in hair shafts No Piedraia hortae Not described Collections of crescent ascospores surrounded by pigmented hyphae Not used for diagnosis
Superficial candidiasis Intertrigo, chronic paronychia, onychodystrophy, cheilitis Yes Candida spp. Yes, particularly in patients with AIDS and depending on the level of immunosuppression Yeasts, pseudohyphae may be observed Fungal elements may be seen through the biopsy, vascular invasion must be determined

Treatment

Treatment consists of topical application of dandruff shampoo, which contains selenium sulfide, over the skin. Topical antifungal imidazoles may also be used, such as Ketoconazole. This is the same treatment plan for tinea or pityriasis versicolor.

See also

References

  1. ↑ 1.0 1.1 Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. pp. Chapter 76. ISBN 1-4160-2999-0.
  2. ↑ James, William D.; Berger, Timothy G.; et al. (2006). Andrews' Diseases of the Skin: clinical Dermatology. Saunders Elsevier. ISBN 0-7216-2921-0.
  3. ↑ Murray, Patrick R.; Rosenthal, Ken S.; Pfaller, Michael A. (2005). Medical Microbiology (5th ed.). Elsevier Mosby.
  4. ↑ Pegas JR, Criado PR, Lucena SK, de Oliveira MA (2003). "Tinea nigra: report of two cases in infants". Pediatric dermatology. 20 (4): 315–7. doi:10.1046/j.1525-1470.2003.20408.x. PMID 12869152.
  5. ↑ 5.0 5.1 Gladwin, Mark; Trattler, Bill. Clinical Microbiology (4th ed.). p. 196.
  6. ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 6.13 6.14 6.15 6.16 6.17 6.18 6.19 6.20 6.21 6.22 6.23 6.24 6.25 6.26 6.27 6.28 6.29 6.30 6.31 6.32 6.33 6.34 6.35 6.36 6.37 6.38 6.39 6.40 6.41 6.42 6.43 6.44 6.45 6.46 6.47 6.48 6.49 6.50 6.51 6.52 6.53 6.54 6.55 6.56 6.57 6.58 6.59 6.60 6.61 "Dermatology Atlas".

External links

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