A canker sore is a painful, open sore in the mouth. Canker sores are white or yellow and surrounded by a bright red area. They are benign (not cancer. See also: Herpes, Fever blisters and Canker sores
A canker sore, or aphthous ulcer, is a mouth ulcer or sore that's open and painful. It's the most common type of mouth ulcer.
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