Red itch on the neck may be atopic dermatitis, light skin disease, etc.. Red itchy neck may be caused by atopic dermatitis, and there are many reasons for atopic dermatitis, such as genetic factors, autoimmune disorders, contact with allergic substances, etc. It is mostly manifested as itchy erythema and papules on the neck and flexed sides of the limbs, with occasional oozing and crusting. Ultraviolet radiation can cause a variety of light skin diseases, such as polymorphic sun rash, chronic photodermatitis, light itchy rash, etc., face and neck are often exposed to ultraviolet light, these parts of the red itch may be caused by light diseases, these diseases are mostly related to the season, usually in winter will be alleviated, and in summer will be aggravated, and easy to recur. In addition to atopic dermatitis, light skin disease, neurodermatitis, urticaria, etc. will also appear in the neck area of red spots, itching, need to be diagnosed by a professional dermatologist, and targeted treatment.