The common cause of cleft lips is lack of water, the lips are mucous membrane, and no skin coverage, prone to seasonal dryness, cleft. Of course there are other reasons, treatment can start from the etiology to prevent this symptom. 1, lack of water: geographical reasons, the northern winter is colder, the air is dry, lips are prone to dryness, cracks, and may also cause bleeding phenomenon. You can apply honey to help moisturize the lip mucosa, and you can also choose lip balm to relieve the symptoms during the dry season; 2, vitamin deficiency: some people are often picky or partial eaters and do not like to eat green vegetables, resulting in unbalanced nutritional intake. Especially the lack of vitamin A and vitamin B2 will cause the phenomenon of dry and cracked lip mucosa; 3, lip inflammation: temperature stimulation, infection, etc. may lead to lip inflammation, will be manifested as dry lips, flaking, severe chapped, pain is more obvious. You can use saline soaked to keep the local clean and moist, and targeted treatment. In addition, factors such as abuse of cosmetics or allergy to light can also lead to chapped lips. Some diseases such as diabetes may lead to the occurrence of chapped lips, and this condition requires active treatment of the original disease.