Alternaria is a saprophytic fungus that naturally subsists on decaying plant materials, but may be an opportunistic pathogen in immunocompromised hosts. We describe a case of dermal cutaneous alternariosis in a 70-year-old patient, who was on systemic steroid administration for autoimmune hemolytic anemia. The patient also had chronic heart failure, liver dysfunction, and diabetes mellitus. Infection was confirmed by histological examination, and multiple positive culture results. Treatment with oral terbinafine and itraconazole was ineffective. We review the literature of dermal cutaneous alternariosis reported in Japan; including our case, 15 cases have been reported. Recognition of Alternaria as a potential opportunistic pathogen is important for the differential diagnosis of dermatologic lesion, such as granulomatous lesion or ulcer, in immunocompromised hosts.
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