Sunburn blisters are second-degree burns, meaning the damage has reached past your outer skin layer into the layer underneath. The single most important thing you can do is leave the blisters intact. That fluid-filled pocket acts as a natural bandage, protecting the raw skin beneath while new tissue forms. Most sunburn blisters take 7 to 10 days to heal completely, but the choices you make in the first few days determine how smoothly that process goes.
Why Blisters Form
A regular sunburn damages only the outermost layer of skin. When UV exposure is intense or prolonged enough, the damage extends deeper, triggering your body to flood the area with fluid as a protective cushion. That fluid separates the damaged top layer from the healing tissue below, creating the blister you see. The skin around it is typically red, moist, and extremely painful to the touch.
Cool the Skin First
Apply a clean towel dampened with cool tap water to the blistered area for about 10 minutes. You can repeat this several times a day. Cool water draws heat out of the skin and temporarily dulls pain. Avoid ice or ice-cold water, which can further damage already injured tissue.
After cooling, you can apply pure aloe vera gel to the surrounding sunburned skin. Skip petroleum jelly and oil-based ointments on the burn. These clog pores and trap heat and sweat against the skin, which is the opposite of what you want during the acute phase.
Leave Blisters Intact
This is the point people get wrong most often. An intact blister is your body’s best wound dressing. Popping it exposes raw, vulnerable skin to bacteria and dramatically increases your infection risk. Resist the urge, even if the blister looks large or feels tight.
If a blister breaks on its own, gently trim the dead skin away with clean, small scissors. Wash the area with mild soap and water, apply an antibiotic ointment, and cover it with a nonstick bandage. Regular gauze sticks to open wounds and causes significant pain on removal, so nonstick dressings or hydrocolloid bandages are a much better option. These keep the wound moist, which promotes faster healing and reduces scab formation.
Managing Pain and Inflammation
Over-the-counter anti-inflammatory pain relievers like ibuprofen help with both the pain and the swelling driving it. Take them as directed on the label, ideally starting as soon as you notice blistering rather than waiting until the pain peaks.
For the skin itself, a nonprescription 1% hydrocortisone cream applied three times a day for up to three days can reduce inflammation on intact, unbroken skin. If your sunburn is severe enough that over-the-counter options aren’t cutting it, a doctor can prescribe a stronger corticosteroid cream.
Stay Hydrated
Blistering burns pull fluid from your body toward the damaged skin. You’re losing water you wouldn’t normally lose, on top of whatever dehydration the sun exposure itself caused. Drink extra water throughout the healing period. If you feel dizzy, nauseated, or unusually fatigued, those are signs your fluid loss is outpacing your intake.
Protecting Blisters While They Heal
Loose, soft clothing over blistered areas prevents friction from rupturing them prematurely. If blisters are in a spot that rubs against clothing or shoes, a nonstick bandage provides a buffer. Keep the skin out of direct sunlight entirely while it heals. New skin forming beneath blisters is far more sensitive to UV damage than normal skin, and re-burning the area can cause lasting discoloration or scarring.
Expect the blisters to gradually reabsorb over the course of a week to 10 days. The fluid decreases, the top layer of skin dries and peels, and fresh pink skin appears underneath. That new skin will remain more sensitive than the surrounding area for several weeks, so continue protecting it with sunscreen and clothing even after the blisters are gone.
Signs of Infection
Most sunburn blisters heal without complications, but broken blisters can become infected. Watch for pus (cloudy, yellowish, or greenish fluid rather than clear), red streaks spreading outward from the blister, increasing pain after the first few days instead of decreasing pain, or warmth and swelling that worsens rather than improves. These signs mean bacteria have entered the wound and you need medical treatment.
When Blisters Need Medical Attention
Small, scattered blisters on your shoulders or back from a day at the beach are uncomfortable but manageable at home. Certain situations call for professional care. Blistering burns that cover a large portion of your body (roughly 20% of your skin surface in most adults, or 10% in children under 10 or adults over 50) need evaluation. Blisters on the face, hands, feet, or genitals also warrant a medical visit because these areas are more prone to complications and scarring.
Fever, chills, or confusion alongside blistering sunburn suggest your body is struggling to manage the injury systemically. Severe blistering sunburn can cause the same complications as any other second-degree burn, including dangerous fluid loss and shock in extreme cases.