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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.
wikiHow to Treat Canker Sores or Mouth Ulcers. Canker sores, also known as mouth ulcers, or aphthous stomatitis, can form on the gums, inner cheeks and lips (anywhere inside of the mouth). Canker sores, while annoying, are common, and usually heal in a week or two. They are not to be confused with cold sores, which form on the outside of the mouth.