Painful dry and cracked lips need to be treated according to the cause, if it is caused by dry weather, daily care; if it is chapped lips, daily care and medication; if it is stomatitis, it needs to be treated according to different causes. 1. Dry weather: If it is due to dry weather, you can apply anti-cracking oil or lip balm to ensure that the skin of the mouth is moisturized. 2. Chapped lips (1) Daily care: you should first remove the irritating factors of daily contact, such as stopping the use of lipstick, eating less spicy food, while paying attention to oral hygiene. (2) Drug treatment: under the guidance of the doctor, weak steroid hormone cream, non-hormonal anti-inflammatory ointment or cod liver oil ointment can be used topically. 3. Keratitis: according to different causes, balanced diet, reasonable adjustment of dietary structure and medication. (1) Infectious keratitis: for different pathogenic microorganisms, local or systemic medication can be administered accordingly. (2) Traumatic stomatitis: remove the cause of the disease, generally focus on local anti-inflammatory, pain relief, and promote healing, if the traumatic wound is too large and too deep, it should be promptly debridement and suturing. (3) allergic keratitis: allergens should be actively removed, and reasonable use of anti-allergy drugs, such as cetirizine. (4) malnutrition keratitis: for systemic diseases such as diabetes, anemia, etc., should be treated for the cause. It can be seen that the causes of dry and cracked skin on the lips are more complex, and it is necessary to identify the cause of the disease for treatment.