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Canker sores are small, shallow ulcers that appear in the mouth and often make eating and talking uncomfortable. There are two types of canker sores: Simple canker sores. These may appear three or four times a year and last up to a week. They typically occur in people ages 10 to 20. Complex canker sores.
Canker sores are shallow, painful sores in the mouth. They are usually red or may sometimes have a white coating over them. You might get them on the inside of your lips, the insides of your cheeks, the base of your gums or under your tongue.anker sores are different from fever blisters, which usually are on the outside of your lips or the corners of your mouth. Canker sores are also called aphthous ulcers. Anyone can get canker sores, but women and people in their teens and 20s get them more often.