The term "tinea incognita" refers to diverse clinical presentation of mycotic 
infections modified by inappropriate use of topical or systemic corticosteroids. 
A 67-year-old male patient with a five-year history of generalized erythematous 
plaques on the trunk and extremities, previously treated with topical 
corticosteroids, is described. The lesions mainly showed a psoriasiform, some 
eczematous appearance, few of them showing a clinical picture of folliculitis. 
The native mycologic specimen was negative. The diagnosis was made on the basis 
of mycologic culture finding of Trichophyton interdigitale growth. Systemic and 
topical antimycotic therapy administered for two months resulted in complete 
regression of skin lesions.