Suggestion: Disease analysis: One of the causes of oral ulcer is inflammation and infection, and the other is lack of trace elements such as iron, folic acid, vitamin B2 and vitamin B6. Guidance: You can take vitamin B2, vitamin B6 and vitamin B complex tablets orally, and add anti-inflammatory drugs for treatment. In addition, Yunnan Baiyao or Bingpeng powder was applied externally to the wound surface of oral ulcer. Don't eat spicy food at ordinary times. It is best to go to the stomatology department for a check-up and make a clear diagnosis before treatment.