Itchy legs scratch out a lot of small bumps may be eczema, hives, scabies and other factors. 1. Eczema: such as long-term exposure to sunlight or wearing chemical fiber pants, resulting in allergic reactions or irritation of the legs, will cause itchy legs, scratching will appear a lot of red pimples, scratching is accompanied by oozing, easy to secondary bacterial infection. 2. Urticaria: may be related to infectious factors, psychosomatic factors, endocrine factors and other factors, usually acute onset of the disease, the skin will appear itchy, scratching will appear lesions, may also be accompanied by a burning sensation, can cause irritability, panic, when the gastrointestinal tract mucosa is involved, but also cause nausea, vomiting, abdominal pain and other symptoms. 3. Scabies: When infected with scabies, it will cause itchy skin, and many small bumps will appear after scratching. Itchy legs scratch out a lot of small bumps, should be alert to the above diseases, it is recommended to go to the hospital dermatology department for detailed examination and treatment, to avoid aggravation of the lesions.