Aphthous ulcer: Because of location, it is probably an aphthous ulcer. Viral in origin. Lasts 10 - 14 days. Warm salt water rinses help. Did you perhaps bite your cheek ? This is also very common.
Answered 9/28/2016
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Ulcer: As with any lesion in the mouth, it cannot be identified without a clinical examination and history. Often a biopsy is required. There are very many possibilities so you would have to see your dentist to find the cause.
Answered 3/22/2020
5.4k views
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