You can tell the degree of a burn by looking at three things: skin color and texture, whether blisters are present, and how much pain you feel. Burns range from first degree (surface-level redness) to third degree (leathery, painless skin), and each level looks and feels distinctly different. Here’s how to identify what you’re dealing with.
First-Degree Burns: Red, Dry, No Blisters
A first-degree burn only damages the outermost layer of skin. It looks like a patch of red or reddish-brown skin that feels warm, dry, and painful to the touch. There are no blisters. Think of a typical sunburn: the area may be tender and slightly swollen, but the skin surface stays intact.
These burns heal on their own within 5 to 14 days and don’t leave scars. They’re the most common type and rarely need medical attention.
Second-Degree Burns: Blisters and Wet, Shiny Skin
Second-degree burns go deeper into the skin and come in two subtypes, each with different warning signs.
Superficial Partial-Thickness
The hallmark is blisters. Underneath those blisters, the skin looks uniformly pink or red and appears shiny and moist. If you press on the exposed area, it temporarily turns white (blanches) and then returns to its pink color. These burns hurt significantly, often more than first-degree burns, because the nerve endings in the upper layer of deeper skin are exposed and irritated. You’ll also notice swelling and layers of skin peeling away. Healing takes 2 to 3 weeks, and scarring is usually minimal.
Deep Partial-Thickness
These burns also produce blisters, but underneath you’ll see a mottled, patchy mix of colors rather than an even pink. When you press on the skin, it blanches slowly or barely at all. Here’s the counterintuitive part: deep partial-thickness burns hurt less than superficial ones. You may only feel pain with firm pressure, because the deeper nerve fibers are partially damaged. These take longer to heal and will leave scars.
Third-Degree Burns: Leathery, Painless Skin
A third-degree burn destroys all layers of the skin and reaches into the tissue underneath. The appearance is unmistakable: the skin looks white, black, or charred, and has a dry, leathery, stiff texture. It does not blister. If you press on it, it will not blanch at all because the blood supply in that area is destroyed.
The most telling sign is the absence of pain at the burn site itself. The nerve endings are gone, so the burned area feels numb. You’ll likely still feel intense pain around the edges, where the burn transitions to less-damaged skin. Third-degree burns cannot heal on their own in any meaningful way, taking more than 8 weeks even with treatment, and they require surgery (typically skin grafting).
Quick Comparison by Appearance
- First degree: Red or pink, dry, no blisters, painful
- Superficial second degree: Blisters, shiny and wet underneath, evenly pink, very painful
- Deep second degree: Blisters, mottled or patchy color underneath, less painful than expected
- Third degree: White, black, or charred, dry and leathery, no pain at the burn site
The Blanch Test
One of the most useful ways to gauge burn depth is pressing gently on the injured skin and watching what happens. In a first-degree or superficial second-degree burn, the area briefly turns white under pressure, then quickly returns to pink or red. This means blood is still flowing normally through the tissue. In a deep second-degree burn, the blanching is sluggish. In a third-degree burn, pressing does nothing at all: the skin stays the same color because the blood vessels are destroyed. This single test can help you distinguish between a burn that will heal on its own and one that needs professional care.
How to Estimate Burn Size
Beyond depth, the total area of a burn matters for determining severity. Medical professionals use a system called the Rule of Nines to quickly estimate what percentage of the body is affected. For adults, each area accounts for roughly 9% of total body surface: the entire head, each arm, the front of each leg, the back of each leg, the chest, the abdomen, the upper back, and the lower back. The groin accounts for 1%.
A simpler method for smaller burns: the palm of your hand (including fingers) represents about 1% of your body surface area. You can use your palm as a rough measuring tool to estimate whether a burn covers 2%, 5%, or more of your body.
Children have different proportions. A child’s head is proportionally larger, accounting for about 20% of body surface, while each leg is closer to 16% and each arm about 8%.
Chemical and Electrical Burns Look Different
Not all burns come from heat, and non-thermal burns can be deceptive.
Chemical burns may not look severe at first but can keep destroying tissue for hours or even days if the substance isn’t fully removed. Some chemicals, like phenol, actually numb the skin, so extensive damage can happen before you feel pain. The burned area may progress from hardened, stiff-looking skin to darkened dead tissue over time. If you notice a burn getting worse rather than stabilizing, a chemical agent may still be active in the skin.
Electrical burns are the most deceptive of all. The visible damage on the skin surface, often appearing as small entry and exit wounds, can dramatically understate what’s happening underneath. Electricity travels along bones and heats them, destroying the surrounding muscle tissue from the inside out. Someone with a small surface burn from an electrical injury can have massive internal damage. Signs of deeper electrical injury include muscle pain that seems out of proportion to the visible wound, dark or cola-colored urine (from damaged muscle tissue breaking down), and numbness or tingling in the affected limb.
Signs a Burn Has Become Infected
Any burn that breaks the skin can become infected during healing. Watch for increasing redness that spreads beyond the original burn edges, a change in the color of the wound bed (especially toward green or dark brown), foul-smelling discharge, increasing pain after the first day or two rather than gradual improvement, or fever. A burn or blister wider than about 2 inches that hasn’t healed within two weeks also warrants medical evaluation.
Burns That Need Emergency Care
Certain burns require a burn center or emergency room regardless of how they look on the surface. Any third-degree burn covering more than 5% of the body (roughly five palm-sized areas) needs specialized treatment. Second-degree burns exceeding 20% of the body in adults, or 10% in children under 10 or adults over 50, meet the same threshold.
Location also matters. Burns on the face, hands, feet, genitals, or over major joints carry higher risks of complications and functional impairment, even if they’re relatively small. All electrical burns, chemical burns, and any burn accompanied by smoke inhalation should be treated as emergencies.
Immediate First Aid
For minor burns (first degree, or small second degree), run cool water over the area for about 10 minutes. Use cool water, not cold or ice water, which can actually worsen tissue damage. Gently remove rings, watches, or tight clothing near the burn before swelling starts, but don’t pull away any clothing that’s stuck to the skin. Cover the area loosely with a clean, dry cloth.
Skip the butter, toothpaste, and oils. These home remedies trap heat against the skin and make the injury worse. For larger or deeper burns, the priority is getting away from the source of injury, keeping the person still, and waiting for emergency help.