The authors report the first Nigerian case of cutaneous and sub-cutaneous phaeohyphomycosis. It was characterized by its original macroscopy: the lesion was pseudo-tumoral and provided with fistulae. So it looked like a mycetoma. The diagnosis was finally made by histology: it showed the typically pigmented mycelium. Cultures have not been made. Etiological agents of phaeohyphomycosis being opportunistic, this disease occurs often among immunosuppressed patients. The knowledge of unusual clinical forms may allow to suspect the diagnosis and to cultivate the exudate: this provides the only specific mycologic diagnosis.