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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.
You may have a canker sore if you have: 1  A painful sore or sores inside your mouth -- on the tongue, on the soft palate (the back portion of the roof of your mouth), or inside your cheeks.  A tingling or burning sensation before the sores appear.