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

Fordyce spots are white or yellow bumps that commonly appear on the edge of the lip. You may also have them on the inside of ...

This condition most commonly results in white bumps and patches inside the mouth or on the tongue, but occasionally it can present on the lips or corners of the mouth, as well, Massick says.