Itchy legs and the appearance of the more you scratch the more itchy, may be the legs atopic dermatitis, eczema, ichthyosis and other causes. 1. Allergic dermatitis of the legs: it is an allergic reaction of the skin caused by allergic substances, and the common symptoms are polymorphic skin lesions, such as erythema, papules, and itching of different degrees. 2. Eczema: It is an inflammatory reaction of the skin, with intense itching caused by a variety of internal and external factors. It can cause a decrease in the quality of sleep at night and affect the usual life. 3. Ichthyosis: It is a hereditary keratinization disorder skin disease. It is mainly characterized by dry skin with ichthyosiform flaking and accompanied by itching. When itching between the legs and the more you scratch the more itchy, it is recommended to go to the hospital in a timely manner, after a clear diagnosis, under the guidance of the doctor for professional treatment.