Warts of lips or oral cavity

**Definition:** Infection of the lips and/or oral cavity, particularly the keratinized surfaces of the gingiva and palate, with "skin" type human papillomavirus (types 2 and 4). Focal epithelial hyperplasia (Heck disease) is a specific form of oral human papillomavirus infection caused by types 13 or 32 and of high prevalence in certain communities in the Americas.