If mouth sores appear inside the mouth, the treatment mainly includes the following aspects. First, you can spray some local medication on the mouth sore, the more common ones are watermelon cream, Yunnan Baiyao and open throat sword spray, local medication can effectively promote the healing of the ulcer surface and reduce the pain. Secondly, you need to apply chlorhexidine mouthwash to gargle, which can reduce the bacterial content in the mouth and prevent local infection. Third, the body’s immunity should be strengthened, such as a balanced diet, physical exercise, and drugs to improve resistance, such as transfer factor and pidomod, etc. After the body’s immunity is improved, the chances of recurrence of mouth sores can be reduced.