English version

mouth ulcer

From Longman Dictionary of Contemporary Englishmouth ulcerˈmouth ˌulcer British English, canker sore American English noun [countable]  a sore area in the mouth of people or animals, caused by illness or a disease
Examples from the Corpus
mouth ulcerSharp teeth can cause terrible ulcers and anyone who has had a mouth ulcer himself will know what agony they can be.
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