[An infant with a black hairy tongue].

At the outpatient clinic, an 8-month-old girl presented with a black hairy tongue. Since 2,5 weeks she used antibiotics because of osteomyelitis in her right humerus. There was no proper oral hygiene. She had no other complaints or abnormalities. The diagnosis 'lingua villosa nigra' was made. This is a benign, self-limiting disorder.