title: Tinea incognito due to Trichophyton mentagrophytes.
abstract: 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.
authors.affiliation: Department of Paediatric Dermatology, Dermatopathology and Micology, Instituto Dermatológico de Jalisco Dr. José Barba Rubio, Zapopan, Jalisco, México.
authors.forename: María Elena
authors.initials: ME
authors.lastname: Sánchez-Castellanos
authors.forename: Jorge Arturo
authors.initials: JA
authors.lastname: Mayorga-Rodríguez
authors.forename: Cecilia
authors.initials: C
authors.lastname: Sandoval-Tress
authors.forename: Mercedes
authors.initials: M
authors.lastname: Hernández-Torres
mesh_terms: D002675:Child, Preschool; D005145:Face / Q000473:pathology; D005260:Female; D006801:Humans; D012867:Skin / Q000473:pathology; D014005:Tinea / Q000175:diagnosis* / Q000382:microbiology; D014249:Trichophyton / Q000145:classification / Q000302:isolation & purification*