Where in the mucosa does aphthous stomatitis (canker sore) occur?

Updated: Sep 25, 2020
  • Author: Ginat W Mirowski, MD, DMD; Chief Editor: William D James, MD  more...
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Recurrent aphthous ulcers occur on nonkeratinized or poorly keratinized surfaces of the mucosa such as following:

  • Labial and buccal mucosa

  • Maxillary and mandibular sulci

  • Unattached gingiva

  • Soft palate

  • Tonsillar fauces

  • Floor of the mouth

  • Ventral surface of the tongue

  • Inferior lateral surface of the tongue

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