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 pseudoimbricata (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.
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