Neisseria cinerea is bacteria known as non-pathogenic strain. However, in rare cases, it can cause opportunistic infections. Those diseases caused by N. cinerea include neonatal ophthalmia, proctitis, pneumonia, peritonitis in patients with continuous ambulatory peritoneal dialysis, endocarditis and meningitis. In this report, we describe a patient with septic arthritis and skin abscess of finger joints that was caused by N. cinerea. A 27-year-old man visited the hospital due to swelling, redness and pain of proximal interphalangeal joint of the left second finger. After blood culture test, ceftriaxone was administered on admission and debridement was performed the affected joints. N. cinerea was identified in the blood culture. The patient was improved with ceftriaxone.

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