Mouth ulcers and chapped lips are usually caused by nutritional deficiencies and are commonly treated with medication, as prescribed by your doctor. Mouth ulcers and cracked lips can be caused by a lack of zinc, iron, selenium and other elements in food, or insufficient intake of vitamins B1, B2, B12 and folic acid. For mouth ulcers, you can use chlorhexidine gargle, compound chlorhexidine liquid, esacridine liquid and other gargles, which have anti-inflammatory effects. If necessary, systemic antibiotics can be used, such as amoxicillin, cephalosporin and other broad-spectrum antibiotics, need to be based on drug sensitivity test strict selection of drugs. And oral water-soluble vitamins, such as vitamin B1, vitamin B2, vitamin B5, vitamin B12 and vitamin C, etc. are mostly components of coenzymes, which can maintain the normal metabolic function of the epithelium and promote the healing of the lesions. It is recommended that patients consult a doctor in a timely manner, follow the doctor’s instructions to actively treat the medication, do not blindly self-medication.