If you have a sunburn, the damage is already done. But you can ease the discomfort: 1. Apply cold compresses to the sunburn or take a cool bath. 2. Apply a moisturizing cream or gel containing aloe. 3. If small blisters form, don't break them. If they break, gently clean the area with mild soap and water and cover the area with gauze. If these tips don't help or your sunburn is severe with large blisters, call your doctor.