A popped sunburn blister is essentially an open wound, and it needs to be treated like one. The best thing to put on it is a thin layer of plain petroleum jelly (like Vaseline or Aquaphor) covered with a non-stick bandage. This keeps the raw skin underneath moist, protected from bacteria, and on track to heal within one to three weeks.
Clean the Area First
Before you put anything on the blister, wash your hands thoroughly with soap and water. Then gently clean the open blister itself with mild soap and water. Pat it dry with a clean towel rather than rubbing, since the exposed skin underneath is extremely tender.
If the blister roof (the loose flap of dead skin) is still partially attached, leave it in place for now. That skin acts as a natural bandage and protects the raw layer beneath it. After several days, once new skin has started forming underneath, you can carefully trim away the dead skin with small scissors sterilized in rubbing alcohol.
What to Apply to the Open Blister
You have two main options: plain petroleum jelly or an antibiotic ointment like Polysporin. Both work, but petroleum jelly is the better default choice for most people. A clinical study comparing the two found no difference in healing outcomes for erythema, swelling, crusting, or new skin formation at any point during recovery. The antibiotic ointment actually caused more burning at the one-week mark, and one participant developed allergic contact dermatitis from it. Plain petroleum jelly gives you the same healing benefit without the risk of a reaction.
Apply a thin, even layer directly over the open wound. The goal is to keep the area moist. Dry, exposed skin forms thicker scabs, heals more slowly, and is more likely to scar. Reapply every time you change the bandage.
What Not to Put on It
Skip home remedies like butter, coconut oil, toothpaste, or vinegar. These can trap heat, introduce bacteria, or irritate the raw skin. Don’t apply ice or ice water directly to the burn either, as extreme cold can damage the already-injured tissue. Aloe vera gel is fine on intact sunburned skin, but on an open blister it can sting and isn’t as effective as petroleum jelly at maintaining the moist environment that speeds healing.
How to Bandage It Properly
Cover the petroleum jelly with a non-stick gauze pad. Regular gauze or adhesive bandages can bond to the wound as it weeps fluid, and pulling them off tears the fragile new skin forming underneath. Non-adherent pads (sometimes labeled “hurt-free” or “non-stick”) are designed to absorb fluid while staying separate from the wound surface. Hydrocolloid bandages are another good option. They seal over the wound, maintain moisture, and can stay in place for a couple of days at a time.
Secure the pad with medical tape around the edges, not over the wound itself. Change the dressing at least once a day, or whenever it gets wet or dirty. Each time you change it, gently clean the area again and reapply petroleum jelly before putting on a fresh bandage.
Managing Pain and Swelling
A popped sunburn blister hurts. Over-the-counter anti-inflammatory pain relievers like ibuprofen help reduce both the pain and the underlying inflammation driving it. Cool (not cold) compresses laid gently over the bandaged area can also take the edge off. Drink extra water, since sunburns pull fluid toward the skin’s surface and your body is already working to repair tissue damage.
How Long Healing Takes
Sunburn blisters are second-degree burns, meaning the damage extends past the outermost layer of skin into the layer beneath it. On average, a popped sunburn blister takes one to three weeks to fully heal. During the first few days, the area will weep clear fluid as your body works to rebuild. After about a week, you’ll notice pink, shiny new skin forming. This new skin is thinner and far more sensitive to UV light than your normal skin.
While healing, keep the area completely out of the sun. If you have to go outside, cover it with loose, breathable clothing rather than relying on sunscreen over an open wound. Once the skin has fully closed and is no longer raw or tender, start applying sunscreen to the area whenever you’re outdoors. The new skin will remain more sun-sensitive for weeks to months.
Signs of Infection to Watch For
Check the blister site every time you change the bandage. Healthy healing looks like clear or slightly yellowish fluid with gradually shrinking redness. Infection looks different:
- Pus: milky white, yellowish, or greenish discharge replacing the clear fluid
- Expanding redness: the skin around the blister becomes increasingly red, swollen, or hot to the touch
- Red streaks: lines radiating outward from the blister, which suggest the infection is spreading
- Increasing pain: pain that gets worse after the first couple of days instead of gradually improving
Any of those signs warrants a visit to a doctor, since infected burns can worsen quickly.
When a Popped Blister Needs Medical Attention
Most single popped sunburn blisters heal fine at home with basic wound care. But some situations call for professional treatment. Seek medical help if blisters cover more than 20% of your body (roughly an entire leg, your whole back, or both arms), if you develop a fever above 102°F, or if you’re experiencing chills, extreme pain, dizziness, dry mouth, or significantly reduced urination. These are signs of a more severe burn response or dehydration that needs more than at-home care. Any sunburn with blisters on a baby under one year old should be evaluated by a doctor immediately.