The back of the hand acne can not be ruled out and ultraviolet allergy has a relationship, the arm for a long time in the exposure of the environment, long-term outdoor workers or travel, long-term exposure to the sun caused by acne or small blisters, and accompanied by obvious itching, considering the ultraviolet allergy induced. To cold compress treatment, at the same time can consider the external application of dinaid, hydrocortisone butyrate or mometasone furoate, twice a day for anti-inflammatory, anti-itching treatment. In addition, the back of the hand acne can also be eczema, eczema is mainly caused by allergies, and contact with the sensitizing substances, such as contact with chemical agents and soap and other sensitizing substances may have a relationship. To actively search for the cause of sensitization, and can wear gloves to prevent allergy aggravation, the back of the hand acne must pay attention to less water.