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Recently, the development of various antibiotics and increasing awareness of oral hygiene have reduced the incidence of serious cellulitis of the cheek, including dental infections. However, some cases invoive serious disease throughout the mediastinal area in elderly patients and those with underlying diseases. This time, we report a case of cellulitis of the cheek due to a bite to the buccal mucosa. The patient was a 10–year–old male. The patient visited hospital and complained of swelling of the left cheek. At the first examination, diffuse redness and swelling accompanied by spontaneous pain and tenderness from the left cheek to surrounding area of the left orbit as well as trismus and swollen lymph nodes in the left submaxillary were noted. A crateriform traumatic ulcer with a diameter of 2.₅ cm and induration likely due to a bite of the left buccal mucosa and accompanied by tenderness were found. CT revealed a high–density region of the buccal fat layer in the left buccal soft tissues as well as extensive and significant swelling and inflammatory reaction. The infusion of antibiotics, draining the abscess through an incision, and the drainage procedure resulted in effective healing of the cellulitis 6 days after admission. Traumatic ulcer and cellulitis may recur due to bite. In addition, for the prevention of adverse habits including teeth grinding and clenching, as well as mental factors due to mental tension and frustration, it is very important to not only undergo dental or oral surgical treatments, but also to consult a psychotherapist or psychiatrist.