A sunburn that blisters has crossed from a first-degree burn into second-degree territory, meaning the damage has reached the middle layer of your skin. It typically takes one to three weeks to heal, and how you care for it in the first few days makes a real difference in pain levels, infection risk, and how your skin looks afterward.
Why Blistering Sunburn Is Different
A regular sunburn damages only the outermost layer of skin and heals on its own within a few days to a week. A blistering sunburn goes deeper, reaching the dermis. Along with blisters, you may notice extreme redness, swelling over a large area, skin that looks wet or shiny, significant pain, and white discoloration within the burned areas. These signs mean your skin’s protective barrier is compromised, which raises your risk of infection and fluid loss.
Cool the Skin Immediately
Get out of the sun as soon as you notice blistering, and start cooling the affected skin. Apply a clean towel dampened with cool tap water for about 10 minutes, and repeat this several times a day. A cool (not cold) bath also works. Adding about 2 ounces of baking soda to the bathwater can help soothe irritation. Avoid ice or ice-cold water, which can further damage burned tissue.
Skip harsh soaps when cleaning the area. A gentle, mild soap is fine, but scrubbing or using anything abrasive will make things worse.
Leave Blisters Intact When Possible
The single most important thing you can do for sunburn blisters is resist the urge to pop them. The fluid inside a blister acts as a natural cushion, protecting the raw skin underneath while new tissue forms. The “roof” of the blister serves as a sterile bandage that’s better than anything you can apply on top.
If a blister breaks on its own, clean the area gently with mild soap and water. Trim away any loose dead skin with clean, small scissors. Then apply a thin layer of antibiotic ointment and cover it with a nonstick bandage. Keep the area clean and change the bandage daily.
If a large blister is in a spot where it’s likely to rupture from friction (like on your shoulder under a bag strap), you can drain it carefully. Sterilize a needle, pierce one edge of the blister to let the fluid drain, and leave the overlying skin in place. Then treat it the same way: clean, apply ointment, and bandage.
What to Put on Your Skin (and What to Avoid)
Aloe vera gel is a safe choice for blistering sunburn. It cools the skin and doesn’t trap heat. Apply it gently without rubbing.
Several common products will actually slow your healing or make pain worse:
- Petroleum jelly and heavy creams: These trap heat and sweat against the burned skin, preventing it from cooling and breathing.
- Numbing sprays with benzocaine or lidocaine: These can irritate burned skin and cause allergic reactions. They also hold heat in.
- Butter, coconut oil, or other home remedies: Anything thick or greasy creates the same heat-trapping problem.
For broken blisters specifically, a simple antibiotic ointment under a nonstick bandage is the standard approach. Some evidence suggests that hydrocolloid wound dressings (the type used for blisters on feet) may heal second-degree burns faster, with better cosmetic results and less elaborate dressing changes, compared to traditional medicated creams.
Managing Pain and Inflammation
Over-the-counter anti-inflammatory pain relievers like ibuprofen or naproxen are your best option. They reduce both pain and the inflammatory response driving the redness and swelling. Take them as directed on the package, and start as early as possible after the burn. Acetaminophen helps with pain but won’t address the inflammation.
Cool compresses remain your most effective topical pain reliever. Reapply them for 10 minutes at a time, several times throughout the day, especially during the first 48 hours when pain tends to peak.
Stay Hydrated
A blistering sunburn pulls fluid from your body toward the skin’s surface. You’ll notice this in the blister fluid itself and in the general swelling around the burn. Drink more water than you normally would in the days following a severe sunburn. If the burned area is large, your fluid needs increase significantly. Signs of dehydration to watch for include dark urine, dizziness, dry mouth, and headache.
What Healing Looks Like
Expect a second-degree sunburn to take one to three weeks to fully heal, depending on how large the area is and where it’s located. During the first few days, blisters may continue to form and the skin will be at its most painful. Over the following week, blisters flatten, the redness fades, and new skin begins forming underneath.
As healing progresses, the burned skin will peel. Let it shed naturally rather than pulling it off, which can tear skin that isn’t ready and create open wounds. Once the new skin is exposed, it will be more sensitive to sunlight for weeks or even months. Keep it covered or use strong sun protection during this period.
Your skin tone in the burned area may look lighter or darker than usual after it heals. This pigment change is common with second-degree burns and typically fades over time, though it can be long-lasting.
When Blistering Sunburn Needs Medical Attention
Not every blistering sunburn requires a doctor, but several situations do. Seek medical care if blisters cover a large portion of your body (your entire back, for instance, or both legs), if you develop fever or chills, if the pain becomes unmanageable with over-the-counter medication, or if you see signs of infection in any blister: increasing redness spreading outward, pus, red streaks, or warmth that gets worse rather than better after the first couple of days.
Burns covering more than 20 to 25 percent of the body’s surface area (roughly one entire leg, or the front of your torso and both arms) can require medical fluid replacement. Children, older adults, and anyone with a weakened immune system should have a lower threshold for seeking help, since their risk of complications is higher.