A canker sore, also known as an apthous ulcer, looks like a small, round or oval lesion that has a white or yellowish center surrounded by red. They tend to be indented, like a crater, rather than raised, like a bump....

Article Overview - Canker Sores (Apthous Ulcers) Causes and Treatments

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Canker Sores (Apthous Ulcers) Causes and Treatments

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Articles - Conditions - Mouth Ulcers - Canker Sores (Apthous Ulcers) Causes and Treatments

Canker Sores (Apthous Ulcers) Causes and Treatments

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