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In my cheek (soft), there is a kind of small button and I believe it is a mouth ulcer. Is it normal to have an ulcer in that location?

Yes, it is normal to have an ulcer in various parts of the mouth, except on the teeth. An ulcer in the mouth can be caused by inflammation from a virus that is causing a sore throat. It is recommended to rest, drink plenty of water, avoid irritating foods, and take pain relievers if needed.