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Blastomycosis, or Gilchrist’s disease, is a chronic granulomatous infection caused by a dimorphic fungus: Blastomyces dermatitidis. Endemic in North America and sporadic in Africa, rare cases have been described in Morocco. We report a case of cutaneous blastomycosis diagnosed in the parasitology-mycology laboratory of the Hassan II University Hospital in Fez. Case report: An 88-year-old diabetic patient undergoing treatment presented with warty lesions on the face and lower limbs with no associated signs. Mycological examination of a skin biopsy confirmed the presence of B. dermatitidis on direct examination in the fresh state. An extension work-up to look for visceral involvement was negative. The patient was put on antifungal treatment with good clinical improvement. Discussion and conclusion: Blastomycosis is a rare systemic fungal infection in Morocco. The portal of entry is often pulmonary; isolated cutaneous involvement is exceptional. Diagnosis is essentially anatomopathological, and mycological studies are useful in confirming the diagnosis. [ABSTRACT FROM AUTHOR]