Most thermal burns are minor and heal well with proper first aid at home. The single most important step is cooling the burn under cool running water for 20 minutes, ideally starting as soon as possible after the injury. What you do in those first minutes, and in the days that follow, has a measurable effect on how quickly the burn heals and whether it leaves a scar.
How you treat a burn depends on its depth. Here’s how to assess what you’re dealing with, cool it properly, care for it as it heals, and recognize when you need professional help.
Identify the Burn Depth First
Burns fall into three broad categories based on how deep the damage goes, and each one looks and feels different.
First-degree (superficial) burns affect only the outermost layer of skin. They look pink to red, feel painful, and stay dry with no blisters. A typical sunburn or a brief touch to a hot pan falls here. These heal in 5 to 10 days without scarring.
Second-degree (partial-thickness) burns go deeper and almost always blister. If the blister breaks, the wound bed underneath is red or pink and turns white briefly when you press on it. These are quite painful. Most heal within 2 to 3 weeks with minimal scarring, though deeper partial-thickness burns take longer and will leave a scar. A clue that the burn is on the deeper end: the wound bed looks mottled rather than uniformly pink, and you feel less pain than you’d expect.
Third-degree (full-thickness) burns destroy the full thickness of the skin and reach the tissue beneath it. The skin looks leathery, stiff, and dry. It won’t blanch white when pressed, and because the nerves are destroyed, the area is numb. These burns always require surgery and take more than 8 weeks to heal.
Cool the Burn Immediately
Run cool tap water (around 15°C or 59°F) over the burn for a full 20 minutes. This is the single intervention with the strongest evidence behind it. Research using controlled burn models shows that 20 minutes of cool running water significantly improves wound healing compared to shorter durations or no cooling at all. The water doesn’t need to be cold, just cool. Even slightly colder water (around 2°C) helps, but ice is a different story entirely.
Do not use ice, ice water, or ice packs. Ice restricts blood flow to the injured tissue and can numb the area so thoroughly that you can’t tell when the skin has become dangerously cold. Leaving ice on a burn for too long can cause frostnip and permanently impair blood flow to the area, which actually increases infection risk and reverses the healing process. Stick with cool tap water.
While you’re cooling the burn, gently remove any clothing or jewelry near the area before swelling starts. If fabric is stuck to the wound, leave it and let a medical professional handle it.
What Not to Put on a Burn
Butter, toothpaste, coconut oil, and egg whites are all folk remedies that trap heat in the wound and introduce bacteria. None of them cool the tissue or promote healing. Even silver sulfadiazine cream, long considered the go-to topical treatment for burns, has fallen out of favor for minor burns. Studies show it can actually delay healing compared to simpler alternatives, and it carries risks of side effects including a drop in white blood cells and skin reactions.
A thin layer of plain petroleum jelly or a simple antibiotic ointment (like bacitracin) over the wound is sufficient for minor burns. Honey-based wound dressings have shown antibacterial properties that outperform silver sulfadiazine in clinical comparisons, and medical-grade honey products are now widely available at pharmacies.
Covering and Dressing the Wound
After cooling and applying a thin layer of ointment, cover the burn with a non-stick dressing. This is important because ordinary gauze will bond to the raw wound surface and tear new tissue when you change it. Several types of dressings work well for burns:
- Polyurethane film dressings (brands like Tegaderm or OpSite) keep bacteria and water out while letting you see the wound through the transparent film. They work best for burns with light drainage and can stay in place for several days.
- Silicone-coated dressings are specifically designed not to stick to the wound, which makes dressing changes significantly less painful.
- Hydrocolloid dressings are widely used for partial-thickness burns. They don’t adhere to the wound bed, and the moist environment they create may have some antimicrobial benefit.
Change the dressing once a day or whenever it becomes wet or dirty. Each time, gently wash the burn with mild soap and water, pat it dry, reapply ointment, and cover it again. If the dressing sticks despite using a non-stick product, soak it with clean water for a few minutes before peeling it away.
What to Do With Blisters
Leave small, intact blisters alone. The fluid inside is sterile and acts as a natural protective layer over the wound. Popping a blister introduces bacteria and removes that barrier. If a blister breaks on its own, gently clean the area, trim any loose dead skin with clean scissors, apply ointment, and cover it with a non-stick dressing.
Managing Pain
Burns hurt, and partial-thickness burns in particular can be intensely painful for days. Over-the-counter pain relief works well for most minor burns when taken on a schedule rather than waiting until the pain becomes severe.
Ibuprofen (400 mg every 8 hours) reduces both pain and inflammation. Acetaminophen (1,000 mg every 6 hours) targets pain through a different pathway and can be taken alongside ibuprofen for stronger relief. Don’t exceed 4,000 mg of acetaminophen in 24 hours. For people weighing under 50 kg (about 110 pounds), the maximum daily dose is lower, at 75 mg per kg of body weight divided into four doses.
Keeping the burn elevated above heart level when possible also helps reduce throbbing, especially in the first 48 hours.
Watch for Signs of Infection
Most minor burns heal without complications, but infection is the main risk during recovery. Check the wound daily when you change the dressing and watch for these warning signs:
- Increasing redness that spreads beyond the edges of the burn
- Swelling that worsens after the first day or two
- Oozing fluid, especially if it’s cloudy, green, or yellow
- A foul smell coming from the wound
- The skin around the burn feeling warmer than the surrounding area
- Fever, chills, or dizziness
Any of these signs mean the burn needs medical evaluation. Infected burns can worsen quickly, and early treatment with prescription antibiotics prevents deeper tissue damage.
When a Burn Needs Professional Treatment
Not every burn can be managed at home. The American Burn Association’s referral criteria provide a useful guide for when to seek care at a burn center or emergency department:
- Second- or third-degree burns covering more than 20% of the body in adults ages 10 to 50, or more than 10% in children under 10 or adults over 50
- Any third-degree burn larger than 5% of body surface area
- Burns on the face, hands, feet, genitals, or over major joints
- Burns that wrap all the way around an arm, leg, or finger
- Burns combined with an inhalation injury (from breathing in hot air or smoke)
- Burns in someone with a chronic medical condition like diabetes that could slow healing
A quick way to estimate body surface area: the palm of your hand (including fingers) equals roughly 1% of your total body surface. If a second-degree burn is larger than a few palms’ worth, or if it’s in a sensitive location, get it evaluated.
Burns are also classified as dirty wounds for tetanus purposes. If your last tetanus shot was five or more years ago, or if you’re unsure of your vaccination history, you’ll need a booster. This is especially relevant for deeper burns or any burn contaminated with dirt or debris.
What to Expect During Healing
First-degree burns typically resolve in under a week. The redness fades, the skin may peel slightly (similar to a sunburn), and no scar forms. You can usually stop covering the burn after 3 to 4 days once the surface feels less tender.
Superficial second-degree burns take 2 to 3 weeks. New pink skin forms underneath the blister or scab, and it will be more sensitive than the surrounding skin for a while. Scarring is usually minimal if the wound stays clean and isn’t repeatedly irritated. Deeper second-degree burns can take a month or longer, and some degree of scarring is unavoidable.
Once a burn has fully closed, the new skin is vulnerable to sun damage and can darken permanently if exposed to UV light. Apply sunscreen with SPF 30 or higher to the healed area for at least 12 months. Keeping the new skin moisturized with a fragrance-free lotion also helps reduce itching, which can be persistent and surprisingly intense during the later stages of healing.