Burns that blister are second-degree burns, meaning the damage reaches past the outer layer of skin into the layer beneath it. Most small blistered burns can be safely treated at home with proper first aid, but getting the steps right matters. How you cool the burn, whether you leave the blister intact, and what you cover it with all affect how fast the skin heals and whether infection sets in.
Cool the Burn Immediately
Run cool (not cold) water over the burned area for at least 10 minutes, ideally 20 minutes. This is the single most important thing you can do right after a burn. Cooling reduces the depth of tissue damage and helps with pain. Use running water from a tap rather than submerging the burn in a bowl or bucket, which is less effective at drawing heat out of the tissue.
Don’t use ice, ice water, or frozen items directly on the burn. Extreme cold can further injure already damaged skin. While the burn is cooling, gently remove any rings, watches, belts, or tight clothing near the area. Burns swell quickly, and anything snug can become a tourniquet. If clothing is stuck to the burned skin, leave it in place and let medical professionals handle it.
Leave the Blister Intact
The blister that forms over a burn is your body’s own bandage. The fluid inside cushions the raw skin underneath and creates a sterile barrier against dirt and bacteria. Popping, peeling, or draining a burn blister removes that protection and opens a direct path to infection.
Keep the roof of the blister (the raised skin covering it) intact for as long as possible. Even if the blister eventually breaks on its own, don’t peel off the dead skin. Leave it in place as a shield over the healing tissue beneath. If a blister does rupture, gently clean the area with mild soap and water, pat it dry, and apply a thin layer of ointment before covering it.
Apply Ointment and Cover the Burn
Once the burn has cooled, apply a thin layer of petroleum jelly or an antibiotic ointment like bacitracin. Either works well for keeping the wound moist, which is essential for healing. One thing to keep in mind: if you start with an antibiotic ointment, switch to plain petroleum jelly after about a week. Prolonged use of topical antibiotics can cause a skin rash.
Cover the burn with a non-stick dressing. Regular dry gauze is a poor choice because it sticks to the wound, promotes scab formation, and causes significant pain when removed. Instead, look for non-adherent gauze pads, many of which come pre-coated with petroleum jelly. Foam dressings and hydrogel pads are also good options and are available at most pharmacies. Wrap the dressing loosely so it stays in place without pressing into the burn.
Change the dressing once a day, or sooner if it gets wet or dirty. Each time, gently clean the burn with mild soap and water, reapply ointment, and put on a fresh dressing. Wash your hands before touching the burn or its dressing. Open or broken blisters are especially vulnerable to contamination.
Watch for Signs of Infection
A burn with a blister is an open invitation for bacteria, particularly once the blister breaks. During the healing process, check the burn daily for warning signs. Increasing redness that spreads outward from the burn edges, warmth around the wound, worsening pain (rather than gradually improving pain), swelling, pus or cloudy drainage, and foul smell all point toward infection.
If you develop a fever or chills alongside any of these skin changes, seek medical care promptly. A spreading red rash around a burn can signal cellulitis, a bacterial skin infection that progresses quickly and needs treatment with antibiotics.
What Healing Looks Like
Second-degree burns damage both the outer skin layer (epidermis) and the layer beneath it (dermis). Because deeper tissue is involved, healing takes longer than a simple sunburn or surface scrape. Most small second-degree burns heal within two to three weeks with proper care, though deeper ones can take longer and are more likely to scar.
In the first few days, the area will be red, swollen, and painful. The blister may grow larger before it eventually flattens or ruptures. Over the following week or two, new skin gradually forms underneath the blister roof. The new skin is often pink or slightly darker than the surrounding area, and it may remain sensitive for weeks after the wound closes. Keeping the healing burn out of direct sunlight helps reduce permanent discoloration.
Burns That Need Professional Care
Not every blistered burn is safe to treat at home. The location and size of the burn matter as much as its depth. Second-degree burns on the face, hands, feet, genitals, or over a major joint (like the knee or elbow) should be evaluated by a medical professional regardless of size. These areas have thinner skin, higher infection risk, or the potential for scarring that limits movement.
Size thresholds also matter. For children under 10 and adults over 50, second-degree burns covering more than 10% of total body surface area require specialized burn care. For other age groups, that threshold is 20%. As a rough guide, the palm of your hand equals about 1% of your body surface area. A burn larger than about 3 inches across, or one that wraps around a limb, is worth having a professional assess.
Any burn that looks white, waxy, or charred has gone deeper than second-degree and needs medical attention. The same goes for burns caused by chemicals, electricity, or prolonged contact with a heat source, all of which can cause damage beneath the surface that isn’t immediately visible.