The first thing you need to do is to get a good idea of what you are getting into. If there are crusts, use compound chlorhexidine gargle wet compresses. Avoid always licking the corners of the mouth with your tongue to avoid rupture and bleeding, which is not easy to heal; 2, medication: rotten corners of the mouth may be caused by a lack of vitamin B2, oral vitamin B2 tablets, folic acid can be taken as prescribed by the doctor. If it is a fungal infection, topical antifungal drugs can be used; 3, regulate diet: pay attention to eating less and more meals, balanced nutrition, more egg yolk, lean meat, vegetables and fruits, pay attention to avoid eating too hot, avoid spicy diet; 4, strengthen exercise: usually pay attention to appropriate increase physical exercise, keep a happy mood, avoid staying up late, enhance the body’s immunity.