Authors report a new case of cutaneous alternariosis in a 73-year-old
man submitted to a long term corticotherapy. Direct microscopic examin
ation of pus taken from pustule and histological study of biopsies rev
eal hyphae and round-shaped fungal cells. Alternaria chlamydospora is
isolated from biopsy samples on culture. This observation is the first
french case of cutaneous alternariosis caused by A. chlamydospora.