Mouth ulcers are healed and white spots are still there may be the presence of submucosal fibrous degeneration, as follows. Submucosal fibrous degeneration may be caused by chewing betel nut, smoking, immunity, lack of vitamin A, C, B and other factors, initially small blisters and ulcers, followed by pale or gray-white plaque-like lesions, which can be touched with fibrous cords under the mucosa. With the development of lesions may appear tongue movement and mouth opening restrictions, resulting in eating, chewing, pronunciation disorders, affecting daily nutritional intake and work life. Mouth ulcers well, the white spots are still there may be other reasons, it is recommended to go to the hospital in a timely manner, clear cause for targeted treatment.