Canker sores do not have a fixed area of growth and usually grow on the neck, shoulders, back, thighs and buttocks. Canker sores are an inflammation of the skin caused by a bacterial infection, with Staphylococcus aureus as the main causative agent. They occur in people with poor hygiene and low immunity, such as those who are malnourished, diabetic, and have been using immunosuppressants or glucocorticoid drugs for a long time. Usually, canker sore cure requires anti-infection, such as topical mupirocin ointment, fusidic acid cream, etc., together with taking antibiotic drugs such as amoxicillin mouth, cephalosporin, etc. for treatment. If the symptoms are serious, surgical treatment is needed. Patients should pay attention to personal hygiene in daily life, take baths and change clothes diligently to keep the affected area dry and clean. Diet should be light, eat less or not eat spicy, greasy and other stimulating food. Timely consultation, under the guidance of the physician medication.