You can apply vitamin B6 ointment, vitamin B2 ointment, and vitamin E ointment topically to the corners of your mouth, or simply apply lip balm to keep the area moist. If the corner of the mouth is broken with local herpes, redness, swelling, and ulceration, it is caused by a viral infection, and you can apply acyclovir ointment locally. If the corner of the mouth is vesiculated and there is a yellowish-white pseudomembrane on it, it indicates a bacterial infection, which can be treated by applying erythromycin ointment to the corner of the mouth for anti-inflammatory treatment. The ruptured corners of the mouth should be avoided because of talking, eating or yawning caused by large open mouth, large open mouth will aggravate the trauma at the corners of the mouth, in the into the diet also avoid eating spicy, irritating food, to avoid food to the corners of the mouth, to eat more vitamin B and vitamin C rich food, such as vegetables, fruits, coarse grains, cereals, lean meat, seafood, soy products, etc., to ensure a balanced nutrition, these are These are conducive to the healing of the corners of the mouth ulcers.