Tinea Incognito due to Trichophyton rubrum in Atopic Dermatitis Patient / 대한의진균학회지

ABSTRACT

Tinea incognito is a dermatophytic infection with an atypical clinical presentation caused by previous treatment with topical or systemic steroids, as well as by the topical application of calcineurin inhibitors such as pimecrolimus and tacrolimus. The diagnosis of tinea incognito is frequently delayed or missed due to loss of typical appearance. Nowadays, as the use of steroid and topical calcineurin inhibitor has been increasing, the incidence of tinea incognito has also increased. Here we report a case of tinea incognito in a 19-year-old girl initially misdiagnosed as irritant contact dermatitis who also had atopic dermatitis and onychomycosis on the left 3rd finger nail. On the basis of the detection of hyphae on KOH examinations and isolation of Trichophyton rubrum by fungus culture, she was successfully treated with oral terbinafine 250 mg/day and topical terbinafine for 12 weeks.