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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.
Have you ever had a canker sore? If so, you know that these small mouth sores can cause major pain. You can get a canker sore on the inside of your lip or cheek, under your tongue or at the base of your gums. Usually canker sores form one at a time inside your mouth, but you can get more than one in a little cluster.he inside of your mouth is delicate, so mouth injuries, such as biting the inside of your lip or brushing your teeth too hard, also seem to bring on canker sores. But anybody can get a canker sore and they may run in families, which means that if your mom or dad gets canker sores, you might get them, too.