Sunburn blisters should be left alone, according to the American Academy of Dermatology. Blisters exist to heal and protect. When a blister is popped, a sunburn may worsen, increasing the chances of an infection.
Most blisters heal without outside interventions. To protect blisters, WebMD suggests that the individual place a loose bandage over the affected area. If a blister ruptures, the individual should clean the area with soap and water. If possible, the individual should retain the flap of skin over the tender area. The sunburn sufferer can apply an antibiotic ointment and dry bandage over the open blister to protect against infections. If blisters become severe and painful, MedlinePlus recommends contacting a medical professional.