Cool the burn under running water for 20 minutes, starting as soon as possible and ideally within three hours of the injury. That single step is the most effective thing you can do to limit damage and speed healing. After cooling, your next steps depend on how deep and how large the burn is.
Cool the Burn With Running Water First
Hold the burned area under cool (not cold) running water for a full 20 minutes. This works by pulling heat out of the tissue, stabilizing blood vessels, and reducing the inflammatory response that can deepen the injury in the hours after it happens. Research from UC Davis Health shows that 20 minutes of cool running water within three hours of the burn measurably improves healing outcomes. Most people stop after a minute or two because the initial pain fades, but the tissue underneath is still hot. Keep going.
Don’t use ice or ice water. They’re too harsh and can further damage skin that’s already injured. Don’t apply butter, toothpaste, or any greasy home remedy. Grease traps heat against the skin and slows its release, which actually makes the burn worse. Plain cool running water outperforms every folk remedy.
How to Tell What You’re Dealing With
Burns are categorized by how deep the damage goes, and each level looks and feels different.
Superficial burns (first-degree) affect only the outer layer of skin. They’re dry, red, and painful, similar to a sunburn. These heal on their own within a few days to a week.
Partial-thickness burns (second-degree) go deeper. The skin looks moist and red, blisters form, and the pain is intense. Hair follicles and oil glands survive, which means the skin can rebuild itself from those structures. Shallow ones typically heal in two to three weeks. Deeper partial-thickness burns are less moist, less painful, and slower to heal because fewer of those regenerating structures remain intact. They often heal with significant scarring.
Full-thickness burns (third-degree) destroy the entire thickness of the skin down into the fat. The surface may look white, brown, black, or waxy. Counterintuitively, these are less painful than partial-thickness burns because the nerve endings in the skin have been destroyed. Full-thickness burns cannot heal on their own from the center of the wound and always require medical treatment.
When to Go to the Emergency Room
Some burns need professional care immediately, regardless of how well you handle first aid. Get emergency help if the burn:
- Looks dry, leathery, charred, or has white, brown, or black patches
- Is larger than about 3 inches (8 centimeters) across
- Affects the face, hands, feet, genitals, buttocks, or a major joint like the knee, shoulder, or elbow
- Wraps all the way around an arm or leg
- Happened alongside smoke inhalation
- Is swelling rapidly
Burns caused by electricity, lightning, or strong chemicals always require emergency care, even if the skin damage looks minor. Electrical injuries in particular can damage muscles, blood vessels, nerves, and internal organs in ways that aren’t visible on the surface. Even a small burn on the eyes, mouth, hands, or genitals warrants a medical visit. Babies and older adults should be seen for burns that would be considered minor in a healthy adult.
Caring for a Minor Burn at Home
Once you’ve cooled the burn for 20 minutes, gently pat the area dry. If blisters have formed, leave them intact. The fluid inside protects the healing tissue underneath, and popping a blister opens the door to infection. If a blister breaks on its own, gently clean the area with mild soap and water.
Cover the burn with a non-stick dressing. Silicone-based wound contact layers are ideal because they protect new tissue growth without sticking to the wound when you change the bandage. Plain non-adherent gauze works too. The goal is to keep the wound surface moist, protected from friction and dirt, and comfortable. Avoid fluffy cotton or anything that could shed fibers into the wound. Change the dressing daily or whenever it gets wet or dirty.
For pain, over-the-counter options work well for minor burns. Ibuprofen helps with both pain and inflammation. Acetaminophen is another option, particularly if you have kidney issues that rule out ibuprofen. Follow the dosing instructions on the package and don’t combine multiple pain relievers without checking that they’re safe to take together.
Watch for Signs of Infection
Burns are particularly vulnerable to infection because the skin’s barrier is broken. Over the days following your injury, watch for spreading redness, warmth, or tenderness in the healthy skin around the burn. A wound that was healing and then suddenly gets worse, deepening or developing new areas of dead tissue, is a red flag. Increasing pain after the first couple of days, pus, or foul smell all warrant a visit to your doctor.
Infection can be tricky to spot in burns because some degree of redness, swelling, and warmth is normal during healing. The key is change over time. If the area around the burn is getting progressively more red, swollen, or painful rather than gradually improving, that’s the pattern to act on. Fever can also signal infection, though mild temperature elevation can occur with burns even without an underlying infection.
Tetanus and Burn Injuries
Burns are classified as “dirty or major wounds” when it comes to tetanus risk. If your last tetanus shot was five or more years ago, you likely need a booster. If you’ve never been fully vaccinated against tetanus, don’t know your vaccination history, or have a condition that weakens your immune system, you may need both a booster and a dose of tetanus immune globulin. This is worth checking with your doctor for any burn that goes deeper than a mild sunburn.
Chemical and Electrical Burns
Chemical burns follow a slightly different protocol. Remove any contaminated clothing and brush off dry chemicals before flushing with water. Then flush the area with large amounts of running water for at least 20 minutes. Don’t try to neutralize a chemical with another chemical, as the reaction can generate more heat and worsen the injury.
Electrical burns are deceptive. The entry and exit points on the skin may look small, but electricity travels through the body and can damage muscles, blood vessels, nerves, and even the heart or brain along the way. Anyone who has been shocked by a significant electrical source needs medical evaluation, even if the visible burn seems minor. Internal damage from electrical injuries often far exceeds what you can see on the surface.