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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, or aphthous stomatitis, are small ulcers in your mouth that cause pain and discomfort when talking or eating. Canker sores come in two varieties: simple and complex. Simple canker sores appear a few times a year and last about a week, and most often occur in people between 10 to 20 years old. Complex canker sores are less common, but people who have had canker sores are more likely to get them [source: WebMD ].