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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 canker sores are small white or yellowish sores or ulcers that develop inside the mouth they are painful self healing and can recur canker sores occur on the inside of the mouth usually on the inside of the lips cheeks and or soft palatethey also can occur on the tongue and in the throatoften several canker sores will appear at the same time and may be grouped in clustershey are painful self healing and can recur canker sores occur on the inside of the mouth usually on the inside of the lips cheeks and or soft palate they also can occur on the tongue and in the throat