The inside of the mouth is normally lined with a special type of skin (mucosa) that is smooth and coral pink in color. Any alteration in this appearance could be a warning sign for a pathological process. The most serious of these is oral cancer. The following can be signs at the beginning of a pathological process or cancerous growth: These changes can be detected on the lips, cheeks, palate, and gum tissue around the teeth, tongue, face, and/or neck. Pain does not always occur with pathology, and curiously, is not often associated with oral cancer.