What are the main clinical types of recurrent aphthous stomatitis (RAS)?

Updated: May 11, 2020
  • Author: Jaisri R Thoppay, DDS, MBA, MS; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Answer

The 3 main clinical types of recurrent aphthous stomatitis (RAS) are as follows:

  • Minor aphthous ulcers (MiAUs, 80% of all RAS)
  • Major aphthous ulcers (MjAUs)
  • Herpetiform ulcers.

However, any significance of these distinctions is unclear (ie, they could just be 3 distinct disorders). Diagnosis is based on history and clinical features. (See the image below.)

Recurrent aphthous stomatitis with ulcers of varyi Recurrent aphthous stomatitis with ulcers of varying sizes - large ulcers on the right buccal mucosa and a small ulcer on the anterior tongue.

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