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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.
Canker sores most often appear on the inner surface of the cheeks and lips, tongue, upper surface of the mouth, and the base of the gums. Symptoms include: 1  One or more painful, red spots or bumps that develops into an open ulcer. 2  White or yellow center.  Small size (most often under one third inch across)