A suspected case of primary cutaneous actinomycosis on the buttock.

Primary cutaneous actinomycosis is rare and can mimic mycetoma, tuberculosis and nocardiosis. The results of cultures (aerobic and anaerobic) are not always positive. A high degree of clinical suspicion should be entertained and a combination regimen of penicillins with sulphonamides should be used for treatment. We report a patient with primary cutaneous actinomycosis over the buttock, who was successfully treated with amoxicillin and sulphonamides.