As of September 2015, there are images online that show what happens with mouth cancer, which is also known as oral cancer. For instance, pictures show ulcerated cancer masses on the lip or tongue or inside the mouth, according to the Oral Cancer Foundation and WebMD.
A mouth cancer image on the National Institute of Dental and Craniofacial Research website displays lesions with nodules inside the cheek. Some images of oral cancer are illustrations rather than photographs. For instance, drawings indicate where cancer is sometimes located inside the mouth or on the lips. Red or white patches could be squamous cell carcinoma, notes Healthline. However, white or grayish patches might indicate leukoplakia, which becomes malignant in certain cases.