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Image Number 949 (Tinea incognito)


Diagnosis: Tinea incognito

Site: Foot,dorsum

Sex: F

Age: 47

Type: Clinical

Description: Psoriasiform rash

Submitted by: Nameer Al-Sudany

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Differential Diagnosis


Tinea circinata is a superficial skin infection with dermatophytes. It classically presents as a red patch or plaque with an active border and clear center. However, improper use of topical steroids based on mistaken diagnosis may alter the clinical picture into an odd or atypical presentation which usually lacks the active border and clear center pattern i.e. tinea incognito (steroid-modified tinea). The presented patient has been treated wrongly with potent topical corticosteroid after being diagnosed as foot eczema. Later she presented with red scaly pruritic plaques on the dorsum of the foot (Psoriasiform or eczematous-like rash). KOH mount preparation of lesional scales yielded positive results of tinea infection (hyphae and spores). She responded well to systemic antifungal therapy.

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