Cracked lips and corners of the mouth may be related to malnutrition, infection, trauma and other factors, you should eat vitamin-rich vegetables and fruits, if necessary, oral vitamin B, amoxicillin and other drugs. 1. Malnutrition: long-term lack of food or nutrient malabsorption of the population is prone to vitamin B deficiency, and vitamin B is involved in the body’s energy metabolism process of a variety of substances, if the lack of vitamin B will cause xerostomia, resulting in cracking of the corners of the mouth. At this time, you should eat more green leafy vegetables and fruits rich in vitamin B, you can also eat vitamin B tablets, pay attention to avoid eating spicy and stimulating food. 2. Infection: bacteria, viruses and other pathogens infected with acute inflammatory lesions in the corner of the lips and mouth, and thus will be localized cracking. You can eat amoxicillin, moxifloxacin, azithromycin, ceftriaxone and other antibacterial drugs or ribavirin, oseltamivir and other antiviral drugs. 3. Trauma: the lips and mouth corners were violently pulled, torn, squeezed, cut and other traumatic injuries resulting in cracked lips and mouth corners. In this case, you can eat some light and easy to digest porridge, soup and other foods and vegetables, fruits and other foods rich in vitamins. Pay attention to the use of medication under the guidance of a physician.