Dry and cracked lips need to be excluded from the causes of drinking too little water, dry air, diet and so on. Pathologic dry and cracked skin may be caused by excessive liver fire. In addition, yin deficiency and fire (deficiency of yin and essence in the body, resulting in hyperactive fire) may also lead to dry and cracked skin. 1. Drinking too little water, dry air, diet: Prolonged exposure to dry air, drinking too little water, eating chili peppers, etc. can all lead to dry and cracked skin. You should pay attention to proper drinking water and diet control. 2. Exuberant liver fire: If the patient is accompanied by symptoms such as dry mouth, bitter mouth, rib pain, dizziness, headache, irritability, etc., it is usually caused by exuberant liver fire. Patients should not be angry and keep a good mood. 3. Yin deficiency fire (Yin essence deficiency in the body, there is a deficiency of fire): dry cracked skin of the mouth patients, accompanied by internal heat and night sweating (abnormal sweating after going to sleep, waking up sweating to stop), dizziness, tinnitus, lumbar and knee soreness (lumbar and knee soreness and weakness of the sensation), the five heart heat (the two hearts of the two hands and two hearts of the two feet hot, and self-consciousness of the heart and chest irritability and sullenness) and so on, belongs to the yin deficiency fire. Patients with yin deficiency and fire exuberance (deficiency of yin essence in the body and hyperactive fire) should not eat spicy and stimulating foods, such as chili peppers, cigarettes and alcohol. If you exclude the physiological dry cracked skin of the mouth, it is recommended to go to the hospital, after the cause is clear and standardized treatment, the patient should not blindly take their own medicine.