Mycosis Fungoides with Tinea Pseudoimbricata Owing to Trichophyton Rubrum Infection

BACKGROUND: Dermatophytes can mimic or possibly trigger mycosis fungoides (MF). OBJECTIVES: To present the case of a 55-year-old male referred for MF refractory to therapy who instead had extensive tinea pseduoimbricata (concentric, annular lesions secondary to Trichophyton rubrum). METHODS: Case report with biopsy and cultures. RESULTS: Oral antifungal therapy dramatically improved his lesions, and only a few MF lesions persisted after treatment. CONCLUSIONS: Concurrent tinea may confound the treatment and diagnosis of MF.