Four-bend wind is actually a TCM diagnostic term. This disease corresponds to a disease in Western medicine, which is mainly referred to as atopic dermatitis. This disease is mainly manifested as skin lesions in the four curved areas, similar to eczema. It is mainly distributed in the elbow fossa of both upper limbs and the popliteal fossa of both lower limbs, so the four curved areas form a kind of skin damage like blood deficiency and wind dryness, similar to wet sores, so it is also figuratively called four curved winds in Chinese medicine. This disease is mainly due to congenital deficiencies, as well as acquired natural factors, or physical factors and induced the formation of chronic itchy skin disease, so the treatment may be more difficult. Treatment is difficult from both the Chinese medicine perspective and the Western medicine perspective. In Western medicine, antihistamine, emollient and biologic treatment are the main treatments, while in Chinese medicine, the main treatment is to regulate the immune function of the body and adjust the balance of yin and yang of the patient to carry out comprehensive treatment.