Malignant "athlete's foot".
D001706:Biopsy; D001913:Bowen's Disease / Q000473:pathology* / Q000601:surgery; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D003937:Diagnosis, Differential; D005528:Foot; D006801:Humans; D008297:Male; D008875:Middle Aged; D012878:Skin Neoplasms / Q000473:pathology* / Q000601:surgery; D014008:Tinea Pedis / Q000175:diagnosis*