Aphthous ulcers, also called canker sores, are a chronic disorder of soft mouth tissue characterized by small, painful purpuric, papular, or erosive lesions that are often surrounded by erythematous (red) margins.1
Q: What soft mouth tissues develop canker sores?
A: Canker sores can erupt on the mucosal surface of the inside lip, sides of mouth, under the tongue and along the side of the tongue. When they are forming, the area swells into a papule, or small bump. Later, the surface erodes and a crater forms with firm pus.
What Are Aphthous Ulcers In Celiac Disease and/or Gluten Sensitivity?
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Lahteenoja H, Toivanen A, Viander M, Maki M, Irjala K, Raiha I, Syrjanen S. Oral mucosal changes in coeliac patients on a gluten-free diet. European Journal of Oral Sciences. Oct 1998;106(5):899,8p. ↩