Canker sores are small, painful reddish lesions in the mouth that have a white or yellow center. Some causes of canker sores are spicy/acidic foods, vitamin deficiencies, braces, and stress.

Both canker sores and oral cancer can appear as an ulcer in the mouth. These lesions may appear on the cheeks, lips, or on or under the tongue. The location alone cannot define the type of lesion ...

Cold sores occur on the outside of the mouth and are caused by the herpes simplex virus. Canker sores are blisters inside the mouth that can occur due to injury, nutritional deficiencies ...