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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.
Sore Palate (Roof of the Mouth Pain) Causes. Pain in the mouth is common and can affect the entire mouth in which case it is referred to as stomatitis or only certain parts like the tongue, cheeks or palate. While the causes of pain in certain parts of the mouth may be overlap, sometimes there are specific causes that only affect a single area.