Dry, cracked and peeling lips may be deficient in vitamin B2 and vitamin A. 1. Vitamin B2: also known as riboflavin, involved in the respiratory chain of biological oxidation, play a role in the transmission of hydrogen atoms, and at the same time can maintain the normal renewal of the mucous membrane. Lack of vitamin B2 will cause dry cracked lips and skin, accompanied by lingual inflammation, keratitis and seborrheic dermatitis. It is recommended to eat more fresh vegetables and fruits. 2. Vitamin A: also known as retinol, is the first vitamin discovered. Vitamin A is involved in a variety of oxidative processes in the body, and its deficiency may affect the biosynthesis of glycoproteins in the mucosal cells, affecting the formation of epithelial cells and secretion of glands, resulting in dry and cracked lips. Normally, it is recommended to eat more animal liver and so on. In addition to the lack of vitamins, there may be an allergic reaction, an allergic reaction is a kind of allergic inflammation, this kind of inflammation will lead to dry cracked lips, accompanied by obvious itching symptoms. Once you find dry cracked lips, it is recommended to go to the regular hospital for diagnosis and treatment, to clarify the cause of the disease, symptomatic treatment, to avoid delaying the condition.