Noncancerous ulcers are invariably painful. An ulcer that doesn't hurt and lasts more than 10 days may be precancerous or cancerous and should be examined by a doctor or dentist. A person who chews tobacco or uses snuff may develop white, ridged bumps on the insides of the cheeks. These bumps can develop into verrucous carcinoma. If such a lump isn't caused by a periodontal abscess or abscessed tooth, it may be a noncancerous growth caused by irritation.
Noncancerous growths are relatively common and, if necessary, can be easily removed by surgery.
In 10 to 40 percent of people, the noncancerous growths recur because the irritant remains. If the irritant is a poorly fitting denture, it should be adjusted or replaced. A doctor or dentist may perform a biopsy to determine whether these rough spots on the lips are cancerous. Cancer on the outside of the lip is more common in sunny climates. Cancers of the lip and other parts of the mouth often feel rock hard and stick to the underlying tissue, while most noncancerous lumps in these areas are freely movable.