Commissural lip fistula
Commissural lip fistula
Definition
A rare otorhinolaryngologic disease characterized by a unilateral or bilateral fistula located at the corner of the mouth, where the vermillion border of the upper lip meets that of the lower lip. The lesion is lined by labial mucosa. It is potentially susceptible to infection.
Also known as cysts and fistulae of the face and oral cavity of labial commissure, labial commissure cysts and fistulae of the face and oral cavity — per MONDO