To clean a burn, run cool water over it for at least 10 minutes, then gently wash the area with mild soap and water or saline solution. That simple sequence, done promptly, removes debris, lowers the skin temperature, and significantly reduces your risk of infection. What you do in the first 20 minutes matters more than almost anything else in burn recovery.
Cool the Burn First
Before you clean anything, cool the burn under running water. The American Red Cross recommends a minimum of 10 minutes, ideally 20 minutes, of cool or cold running water directly on the burned skin. This isn’t just about pain relief. Cooling limits how deep the thermal injury spreads into surrounding tissue, which can mean the difference between a burn that heals on its own and one that needs medical care.
Don’t exceed 40 minutes of cooling, as prolonged exposure raises the risk of hypothermia, especially in children or older adults. And skip the ice. Ice and very cold water can constrict blood vessels and actually worsen tissue damage. Room-temperature tap water works well.
How to Clean the Wound
Once the burn is cooled, wash it gently with mild soap and clean running water. You’re removing any dirt, loose skin, or debris that could harbor bacteria. Use your hands or a soft cloth rather than scrubbing, since burned skin is fragile. If you have saline wound wash in your first-aid kit, that’s a good alternative, but plain soap and water works just as well for a minor burn.
Do not use alcohol, hydrogen peroxide, or iodine on a burn. These can damage exposed tissue and slow healing. Likewise, skip the butter, toothpaste, and cooking oil. These home remedies trap heat against the skin, cause irritation, and make the injury worse.
What to Put on It After Cleaning
After washing, pat the area dry and apply a thin layer of plain petroleum jelly. You might assume antibiotic ointment would be better, but research shows it offers no advantage over petroleum jelly for preventing infection or speeding healing. Antibiotic ointments also carry a small risk of allergic contact reactions, so petroleum jelly is the preferred option for routine burn care.
Cover the burn with a non-adherent dressing or fine mesh gauze, then wrap loosely with a bandage. The goal is to keep the wound moist and protected without sticking to it. How often you change the dressing depends on how much the wound is weeping. A dry, healing burn may only need a dressing change once a day, while a burn that’s producing a lot of fluid may need fresh bandages twice daily. Each time you change the dressing, gently wash the burn again with soap and water, reapply petroleum jelly, and re-bandage.
Handling Blisters
Burns often produce blisters within hours. If a blister is intact and not causing problems, it’s generally safest to leave it alone. The fluid-filled layer acts as a natural barrier against bacteria. If a blister has already broken on its own, gently peel away the loose dead skin with clean hands (or tweezers if you have them) and treat the exposed area like an open wound: wash, apply petroleum jelly, and cover with a non-adherent dressing.
Don’t intentionally pop blisters at home. Once the outer skin layer is broken, bacteria can enter the wound more easily, and the burn becomes harder to keep clean.
Burns That Need Professional Care
Not every burn can be managed at home. The location and size of the burn matter as much as how deep it is. Burns on the face, hands, feet, genitals, or over major joints like knees and elbows should be evaluated by a medical professional, even if they look minor. These areas are prone to complications from scarring and infection.
A quick way to estimate burn size: your palm (fingers together) represents roughly 1% of your total body surface. Burns covering more than about 10% of the body in children under 10 or adults over 50, or more than 20% in other age groups, meet criteria for specialized burn center care. Any burn that goes fully through the skin (white, leathery, or charred appearance with no pain sensation) needs emergency treatment regardless of size.
Electrical burns, chemical burns, and burns involving smoke inhalation are also automatic reasons to seek emergency care, since the visible damage often underestimates the injury beneath the surface.
Tetanus and Burn Wounds
Burns are classified as “dirty” wounds for tetanus purposes, which means the threshold for needing a booster is lower than for a clean cut. If your last tetanus shot was five or more years ago, or if you’re unsure of your vaccination history, you’ll likely need a booster. If you’ve completed your primary vaccine series and had a shot within the past five years, you’re covered.
Daily Cleaning Routine as the Burn Heals
Burns take anywhere from a few days to several weeks to heal depending on depth. Throughout that time, keeping the wound clean is the single most important thing you can do to prevent infection. Wash the burn once or twice daily with mild soap and water during each dressing change. Look for signs of infection each time: increasing redness spreading beyond the burn edges, green or foul-smelling drainage, increasing pain after the first day or two, or fever. Healthy healing looks like a gradual decrease in redness and weeping, with new pink skin forming from the edges inward.
Keep the area moisturized with petroleum jelly throughout the healing process. Letting a burn dry out increases pain and slows the growth of new skin. Once the wound has fully closed and no raw areas remain, you can stop bandaging, but continue moisturizing and protecting the new skin from sun exposure for several months.