When the summer sun, the arms get small bumps, accompanied by itching, mainly due to solar dermatitis, mainly due to excessive exposure of the skin to ultraviolet radiation produced by the inflammatory reaction, can choose general treatment, drug therapy, home care and other relief. 1. General treatment: patients should do a good job of sun protection to avoid infection and secondary damage. Meanwhile, aloe vera gel can be applied to relieve local pain and itching. 2. Medication: Patients can apply topical glycerite lotion to stop the itching effect. You can also choose hydrocortisone and other glucocorticoid medication, can play such anti-inflammatory effect. For the phenomenon of local oozing, can choose to compound borax solution wet compress treatment. 3. Family care: patients should keep the local clean, to prevent infection, to choose to wear loose breathable clothing, avoid rubbing the affected area. It is recommended that patients appear in the summer sun on the arm after the symptoms of small bumps, timely to the hospital, clear reasons under the guidance of the doctor to give standardized treatment, the use of drugs need to follow the doctor’s instructions.