The smooth, pink skin lining the mouth is called mucosa. Abnormalities in the color or texture of this skin can sometimes indicate pathology. Any concerns with the skin in the mouth, a sore that is not healing properly, or a lump on the inside of the cheeks, palate, gums, or lips may merit a biopsy so that the tissue sample can be tested for oral cancer. Please do not ignore these warning signs and mention any concerns you may have during your visit.