White or red lesions in the mouth are sometimes an early sign of oral lip cancer, cites the National Institute of Dental and Craniofacial Research. Other signs include difficulty chewing, bumps or swellings on the lips or gums, and pain or numbness in any area of the face or mouth.
In addition to cancers of the lip, oral cancer includes cancers of the tongue, sinuses, throat, floor of the mouth, cheeks, and hard and soft palate, states WebMD. Risk for oral cancer increases with age, tobacco use, sun exposure and excessive use of alcohol, according to the National Institute of Dental and Craniofacial Research. Diets low in vegetables and fruits may also increase risk of oral cancer.