Leukoedema, reactive hyperkeratosis, or cheek biting.
D002610:Cheek / Q000293:injuries*; D003937:Diagnosis, Differential; D006801:Humans; D007642:Keratosis / Q000473:pathology*; D007967:Leukoedema, Oral / Q000473:pathology*; D009059:Mouth Diseases / Q000473:pathology*; D012652:Self Mutilation / Q000175:diagnosis*