Cracked nose refers to the skin around the nose cracked mouth, may be caused by dry skin, or seborrheic dermatitis, chronic contact dermatitis and other diseases. 1. Dry skin: when the skin around the nose is dry and lacks moisture to moisturize, the skin will crack, which is a normal physiological phenomenon. 2. Seborrheic dermatitis: the etiology of this disease is not clear, may be related to heredity, Malassezia infection, alcoholism, improper diet, neurological dysfunction, emotional stress and other factors. Often occur in the scalp, face, chest and back, part of the disease is serious facial seborrheic dermatitis patients will appear local skin cracks, can be manifested as the skin around the nose cracked mouth. 3. Chronic contact dermatitis: the occurrence of this disease is related to contact with exogenous allergens, such as cosmetics, skin care products, animal dander, pollen, etc., the clinical symptoms of scaling, cracking and mossy skin is mainly, so the patient will appear around the nose skin cracked mouth. It is recommended that patients with cracked skin around the nose go to the hospital to clarify the specific cause.