Recurrent mouth sores Recurrent mouth sores are one of the summer-prone oral diseases. When the disease flares up, single or multiple round or oval ulcers of varying sizes occur on the mucosa of the lips and cheeks, with neat margins and a central depression, covered with a grayish-yellow or light yellowish-white fibrinous pseudomembrane and marked local burning pain. Recurrent mouth sores are recurrent, self-healing, and cyclic in nature. The etiology of the disease is still unclear, and a variety of factors are associated with it, such as indigestion, gastric ulcer, diarrhea, constipation and other digestive diseases; genetic factors also play a part. Some female patients are related to menstrual cycle; lack of some trace elements such as iron, zinc, copper, vitamin B12, folic acid, etc. can lead to the occurrence of ulcer; it is also easy to develop when the immunity is low due to mental tension, emotional fluctuation, cold and fever, lack of sleep and overwork. Its treatment can be divided into local and systemic treatment, including the use of mouthwash, painkillers, erosion agents, immune enhancers, etc., but its own regulation should not be neglected. In addition, the hot weather in summer, people like to eat spicy food, which can aggravate or induce mouth ulcers, lichen planus and other oral diseases, therefore, the diet should be light.