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Canker sore. Canker sores, also called aphthous ulcers, are small, shallow lesions that develop on the soft tissues in your mouth or at the base of your gums.Unlike cold sores, canker sores don't occur on the surface of your lips and they aren't contagious. They can be painful, however, and can make eating and talking difficult.anker sores, also called aphthous ulcers, are small, shallow lesions that develop on the soft tissues in your mouth or at the base of your gums.
canker sore overview canker sores also known as aphthous ulcers are among the most common causes of painful sores in the mouth the classic lesion is a small less than 1 centimeter oval to round ulcer with a erythematous red border they occur on the mucous membranes inside the mouthanker sore overview canker sores also known as aphthous ulcers are among the most common causes of painful sores in the mouth the classic lesion is a small less than 1 centimeter oval to round ulcer with a erythematous red border they occur on the mucous membranes inside the mouth