Wrist bumps after scratching running water, very itchy the more you scratch, consider contact dermatitis, eczema and other diseases, can be treated by topical drugs, oral medication and other measures. 1 contact dermatitis: skin contact allergic reaction caused by sensitizers, will lead to skin erythema, blisters, vesicles, self-conscious itching, scratching can be brought to the causative agent far away from the site, and produce similar lesions, can be treated with topical medications: glycerine lotion, hydrocortisone cream; or oral antihistamine drugs, such as cetirizine. 2. Eczema: Inflammatory skin reactions caused by a variety of internal and external factors, acute eczema may cause skin erythema, small pimples, small blisters in severe cases, ill-defined, long due to scratching, the formation of vesicles, conscious itching. Can be used externally glucocorticoid mometasone furoate cream, etc., can also be oral antihistamine cetirizine, etc.. Wrist pimples after scratching running water, very itchy more and more scratching, there may be other reasons, it is recommended to go to the hospital in a timely manner for examination, follow the doctor’s instructions for treatment.