Odontogenic sinus tracts.
Odontogenic sinus tracts are the most common cause of a chronically draining, fixed, nodulocystic papule of the face and neck. Injury or disease of a tooth may result in a periapical abscess that subsequently dissects along the path of least resistance and erupts through the skin. If recognized early, the sinus tract usually resolves after appropriate endodontic therapy or extraction.
Adult↗