Most cases of dry lips may be formed by allergic lip infection or chronic lip infection in the lip area. This situation is generally common in the lip area contact with allergens, the formation of chronic allergic inflammatory reaction, if the inflammation repeatedly does not recede, and often recurrence, will certainly cause the lip area skin stratum corneum and mucous membrane surface dry symptoms, the loss of skin appendages to its moisturizing effect, may appear dry, cracked, and even cracked, bleeding and other symptoms. If the lips appear after the symptoms, you need to promptly treat, local can be appropriate to use nourishing drugs, such as urea cream, glycerin, etc.