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What are canker sores? Canker sores (also called aphthous ulcers) are different than fever blisters. They are small, red or white, shallow ulcers occurring on the tongue, soft palate, or inside the lips and cheeks; they do not occur in the roof of the mouth or the gums. They are quite painful, and usually last 5-10 days.
I have a painful ulcer on the right side inner cheek. I've had canker sores This ulcer is smaller n more painful. Yes: You absolutely can have oral herpes. Except for the initial episode the location is always on the firmer or attached tissue, such as the roof of the mouth or areas close to the teeth.