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Mycoses. 2007 Jan;50(1):85-7.

Tinea incognito due to Trichophyton mentagrophytes.

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  • 1Department of Paediatric Dermatology, Dermatopathology and Micology, Instituto Dermatológico de Jalisco Dr. José Barba Rubio, Zapopan, Jalisco, México.


Tinea incognito is a ringworm infection modified by corticosteroids. We report a case of a 2-year-old girl who developed tinea incognito due to Trichophyton mentagrophytes after applying methylprednisolone aceponate for 3 months. Diagnosis was confirmed by histopathologic and mycological examination, which led to the identification of Trichophyton mentagrophytes var. mentagrophytes, a zoophilic dermatophyte. Previous corticosteroid use in dermatophyte infections can alter their clinical appearance leading to misdiagnosis and delay in appropriate therapy.

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