Mouth ulcers that always come up are clinically called recurrent mouth ulcers. The causes of mouth ulcers are broadly divided into two categories: first, mouth ulcers caused by the lack of certain trace elements, such as vitamin B and zinc deficiency caused by mouth ulcers, it is recommended that patients can supplement some zinc gluconate oral solution and vitamin B drugs, after the balance of trace elements in the body, the symptoms of mouth ulcers will improve. Secondly, the mouth ulcers caused by the patient’s organism resistance decline or fire and other reasons. It is often related to the patient often stay up late or like to eat spicy, stimulating food, poor living habits and other reasons, it is recommended that patients can change their lifestyle, do not stay up late, etc.; you can properly supplement the drugs to enhance the body’s immunity, such as transfer factor, local can use tretinoin gel or watermelon cream spray to promote the healing of ulcers.