Dry and cracked lips may be suffering from labiitis, a skin disease with dry, cracked and flaky lips as the main clinical manifestation. There are many causes of xerostomia, and treatment should consider whether it is caused by allergies, such as toothpaste, lipstick, food allergies, in which case anti-allergy treatment is needed. If the anti-allergy treatment is ineffective, in-depth examination is needed, such as discoid lupus erythematosus of the skin is also manifested as dry and cracked mouth and lips, flaking, vesicles, etc. Herpes on the lips can also cause cracks at the corners of the mouth. After the appearance of lipitis if only mild dryness and peeling, the best way is to drink more water, maintain the humidity of the living environment, eat less spicy, stimulating food, quit smoking and alcohol, the use of a single ingredient lip balm, do not because of dry lips involuntarily lick the lips, it will make the lips more and more lick the drier, and some people often tear the skin, but also make the situation of the lips will worsen. Discoid lupus erythematosus in the mouth and lips is an autoimmune disease that requires systemic immunotherapy. Herpes labialis is caused by the herpes simplex virus and requires antiviral treatment.