A mouth ulcer is an ulcer that occurs on the mucous membrane of the oral cavity.
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EN
A mouth ulcer is an ulcer that occurs on the mucous membrane of the oral cavity.
Wikipedia
Ulcer that occurs on the mucous membrane of the oral cavity
Wikidata
An aphthous ulcer; an open sore in the mouth, or rarely a break in the mucous membrane or the epithelium on the lips or surrounding the mouth.
Wiktionary
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