A 68 year-old man with uncontrolled diabetes mellitus was presented with a single 4 * 2.5cm sized undermined purulent ulcer with a black eschar surrounded by erythematous indurated plaques on the dorsurn of the his left foot. Fungal hyphae were found in the deep dermis of the skin biopsy specimen. Aspergillus flavus was cultured and isolated by repeated fungal cultures from the pus and tissue pieees of skin biopsy specimens. Wide surgical debridement followed by a skin graft, and adjuvant antifungal treatment applied twice did not cure the skin lesion. We report a case of cutaneous aspergillosis showing a poor outcome in spite of surgical therapy and antifungal medication. (Kor J Dermatol 1996;34(2): 350-354)