Canker Sore

**Semantic type:** Disease or Syndrome

**Definition:** A recurrent disease of the oral mucosa of unknown etiology. It is characterized by small white ulcerative lesions, single or multiple, round or oval, lasting for 7-14 days and healing without scarring.

**Synonyms:** - Aphthous Stomatitis - Aphthous Ulcer - Aphthous stomatitis