The common causes of chapping behind the ears of babies are insufficient warmth, lack of nutrients, skin diseases and so on. 1. not enough warmth: especially in the cold winter, if the baby’s ears are not well protected, by the cold air attack, the ear root of the capillaries will contract, the local blood flow is not enough, the nutritional protection of the skin to reduce the role of the ear will be chapped. 2. lack of nutrients: when the baby’s body lacks vitamin A, B₂, E, the skin surface secretion of mucus and sebum will be reduced, and the skin will also lose a certain degree of elasticity, thus appearing dry, chapped, peeling. These abnormalities may occur behind the ear. 3. Skin diseases: such as eczema, contact dermatitis, psoriasis and other skin diseases, if it occurs in the baby behind the ear, due to the role of inflammatory substances, can lead to flaking, dry, itchy, cracked skin behind the ear. If the baby chapped behind the ear, parents should take the baby to the hospital in time to identify the cause of the disease, by professional doctors to implement individualized treatment.