Cutaneous actinomycosis localized on the perianal area and buttocks.

Introduction. Actinomycosis is a rare spreading suppurative and granulomato us disease. in 50 to 60 p. 100 of cases, cervico-facial area is involved. i nvolvement of other cutaneous areas is very uncommon. Case-reports. Two men (51 and 58 year-old, respectively) were admitted to t he hospital because of erythematous and violaceous nodules with Fistulizati on to the skin, localized on the perianal area and buttocks for several mon ths. Bacterial cultures of the pus and of skin biopsy specimens yielded Act inomyces meyeri in case 1 and Actinomyces israelii in case 2. Patients did not have other infectious lesions. Treatment included systemic antibiotics and surgical iterative excisions in case 1. Discussion. The main interest of those two cases is their similar clinical presentation and in one case the rarity of the micro-organism involved (Act inomyces meyeri). Since the lesions involved only the skin, we postulate th at the organism may have extended from the oral mucosa through the gastroin testinal tract.