Arms sunburned can be iced, apply moisturizing products, replenish moisture and other treatments, but also the use of topical medications. 1. Cold compress: is the most important point, after the sunburn must be timely cold compress sunburned parts, can effectively relieve the redness, swelling, pain and other symptoms of sunburn. 2. Apply moisturizing products: such as moisturizing cream, can play a role in repair and anti-inflammatory, but also can moisturize and nourish the skin, to promote the rapid repair of the damaged skin barrier. 3. More hydration: Sweating in the sun will take away a lot of water from the body, making it easy to get dehydrated, so you should increase the amount of water you drink appropriately. 4. Topical medication: you can use glycerine lotion, hormone ointment under the guidance of a doctor; if the skin is painful, you can follow the doctor’s instructions to use lidocaine gel. Sunburn patients who need to use drugs, need to be under the guidance of a doctor, do not blindly use their own medicine.