First report of subcutaneous abscess caused by .

Approximately 90% of skin infections are thought to be attributable to and , along with some anaerobic bacteria such as and species, which are considered significant causative agents in post-operative skin infections especially in diabetics. Species from the anaerobic genus are known to cause oral infections, but rarely cause infection of the skin. In this case report, we describe a subcutaneous abscess caused by in a 67-year-old man who had started chemotherapy for lung cancer (cT3N3M0 stage Ⅲ B) three days prior to consulting a dermatologist. On clinical examination, a fist-sized mass with a hot sensation was observed in the left temporal region of the face, and treatment with cefazolin was commenced at 6 g/day. After three days, the mass was drained via skin incision and pus culture was performed, which revealed infection with . The patient was successfully treated with abscess drainage and antibiotics therapy. We suggest that in tandem with immunosuppression, could be a cause of skin infections.