Itchy bumps after scratching, there may be hives, atopic dermatitis, eczema and other causes. 1. Urticaria: Temporary increase in vascular permeability of the skin and mucous membranes, resulting in limited edema, wheals, itching, scratching or scratching with a blunt instrument across the skin for a few minutes will appear along the scratches stripes and bumps. So it can also lead to itchy bumps after scratching. 2. Atopic dermatitis: it is a chronic inflammatory skin disease related to genetic and allergic factors, which can also cause symptoms of bumps after scratching. 3. Eczema: is caused by internal and external stimulation of a variety of factors in the superficial dermis and epidermal inflammation, may cause the skin to have a rash oozing, mossy changes and other symptoms, will also be manifested as itchy bumps after scratching. There may be other reasons for itching and scratching, it is recommended to go to the hospital in time to clarify the cause of the disease, and follow the doctor’s instructions for treatment.