A second-degree burn damages both the outer layer of skin (epidermis) and part of the layer beneath it (dermis). This makes it more serious than a sunburn-like first-degree burn but less severe than a third-degree burn, which destroys skin entirely. The hallmark signs are blisters, shiny and moist-looking skin, swelling, and significant pain. Most small second-degree burns heal at home within a few weeks, but larger or deeper ones can require specialized medical care.
What Makes It Different From Other Burns
Burns are classified by how deep they go. A first-degree burn only affects the epidermis, causing redness and mild pain, like a typical sunburn. A second-degree burn pushes deeper into the dermis, where blood vessels, sweat glands, and nerve endings live. That deeper damage is what triggers blistering and the wet, weepy appearance of the wound.
Third-degree burns go through all layers of skin and sometimes into the fat or muscle beneath. Here’s the counterintuitive part: third-degree burns often hurt less than second-degree burns. That’s because the nerve endings in the skin are destroyed along with everything else. Second-degree burns leave those nerve endings exposed and irritated, which is why the pain can be, as the Mayo Clinic puts it, “terrible.”
Superficial vs. Deep Second-Degree Burns
Not all second-degree burns are the same. Doctors split them into two categories based on how far into the dermis the damage reaches.
- Superficial partial-thickness: These affect the upper portion of the dermis. Blisters typically form within 24 hours. The skin underneath is red, painful, and blanches (turns white briefly) when you press on it. These burns generally heal within two weeks without scarring.
- Deep partial-thickness: These extend further into the dermis and may appear white or splotchy rather than bright red. They still hurt, but sensation can be somewhat reduced compared to superficial burns. Healing takes longer than two weeks and carries a higher risk of scarring. Some deep partial-thickness burns require skin grafting.
The distinction matters because the healing timeline and scarring risk are very different. Research on children with partial-thickness burns found that every child whose burn took longer than 14 days to heal developed raised (hypertrophic) scarring. Even burns that healed within two weeks still showed pigment changes in about one in four cases.
What a Second-Degree Burn Looks and Feels Like
The most recognizable feature is blistering. Fluid collects between the separated layers of skin, forming raised pockets that can range from small dots to large, fluid-filled bubbles. The surrounding skin often looks darker than usual, shiny, and wet. Swelling is common and is a sign your immune system has already started responding to the injury.
Pain is usually intense, especially in the first few days. The exposed nerve endings in the dermis react strongly to air, touch, and temperature changes. You may also notice the area feels warm or throbs, even at rest.
First Aid for a Fresh Burn
The most important step in the first few minutes is cooling the burn with running cool water for about 10 minutes. Use cool water, not cold. Cold water or ice can actually worsen the injury by constricting blood vessels and damaging already-stressed tissue.
After cooling, cover the burn loosely with a clean, non-stick bandage. Avoid dry gauze directly on the wound. It sticks to the raw skin, promotes scab formation, and causes significant pain when removed. Non-adherent films or fine mesh gauze paired with an antimicrobial ointment are better options. Honey-based wound dressings have also shown strong results for superficial partial-thickness burns, healing them as well as or better than several conventional treatments.
Leave blisters intact. An unbroken blister acts as a natural sterile barrier. If a blister breaks on its own, keep the area covered with a clean bandage to prevent infection.
Signs of Infection
Burned skin is vulnerable to bacteria because its protective barrier is compromised. Normal healing involves some redness and swelling, but certain changes signal that infection has set in. Watch for increasing pain that gets worse instead of better over time, significant swelling beyond the burn’s edges, and any pus or foul-smelling drainage from the wound. An infected burn needs professional treatment, as the infection can spread into deeper tissue or the bloodstream.
When a Burn Needs Professional Care
Small second-degree burns on a non-critical area of the body can often be managed at home. But certain burns require treatment at a specialized burn center. The referral criteria are based on burn size, location, and the patient’s age.
- Size: Second-degree burns covering more than 20% of total body surface area in adults ages 10 to 50, or more than 10% in children under 10 or adults over 50.
- Location: Burns on the face, hands, feet, genitals, or over major joints. These areas have thin skin, critical function, or high risk of complications that affect mobility and quality of life.
- Other factors: Electrical burns, chemical burns, burns combined with other injuries like fractures, and burns in people with preexisting conditions that could slow healing.
Healing and Long-Term Outcomes
Superficial second-degree burns typically heal within one to two weeks as new skin cells migrate up from the surviving deeper layers of the dermis. During this time, the skin may peel, itch, and look pink or discolored. That discoloration can persist for weeks or months after the wound itself has closed.
Deep second-degree burns take three weeks or longer to heal and are more likely to leave permanent scars. The longer a burn takes to close, the greater the chance of raised, thickened scarring. Burns that heal within two weeks rarely scar significantly, while those that extend beyond that window almost always do. Some deep burns heal so slowly, or with such poor-quality skin, that surgical skin grafting becomes the better option to reduce long-term scarring and restore function.
Pigment changes are common regardless of depth. The healed skin may end up lighter or darker than the surrounding area, and this can be especially noticeable in people with darker skin tones. Sun protection on healed burn sites is important during the first year, as new skin is more vulnerable to UV damage and further pigment changes.