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.

Abscess If you notice a painful bump on the roof of your mouth, it could be an abscess—an infection that forms when bacteria ...

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then evolve into a white, yellowish lesion with a red border, less than 1mm in diameter. He also says canker sores are one of ...

Any mouth sore or rash persisting beyond two weeks warrants professional assessment, regardless of whether it causes pain or discomfort. White or red patches that don’t wipe away may represent ...

If you have leukoplakia, you may get white sores or patches on your gums, as well as on the bottom of your mouth and inside your cheeks. Your tongue may also appear white. The possible causes of ...