The causes and treatments of red, swollen and itchy lips are mainly the following: First, allergy, allergy can lead to angioneurotic edema of the lips, causing swelling, tightness, pain and itchiness of the lips in a short period of time. In the treatment, the first thing is to get rid of the food, drugs and cosmetics suspected of causing allergy, and at the same time, you can take desensitizing drugs, such as paracetamol. Secondly, patients suffering from chronic lip inflammation, lip inflammation should avoid stimulation of the lips by external cold, wind and sunlight, so they should wear a mask when they go out, apply petroleum jelly or lip balm on the lips, and quit the bad habit of licking and biting lips, and take vitamin C tablets, vitamin B tablets, zinc gluconate oral solution and iron to supplement vitamins and trace elements. Third, with discoid lupus erythematosus, the disease needs to be treated with glucocorticoids and immunosuppressants under the guidance of doctors.