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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.
It could mean: Youâre stressed. Many people have had the unpleasant experience of a canker sore. These are punched-out, painful areas that occur on the tongue or cheeks. They are most painful for the first four to five days, then subside and eventually disappear within two weeks.