You can identify a burn’s degree by looking at three things: skin color, texture, and how much it hurts. A first-degree burn is red and dry with no blisters. A second-degree burn is pink, wet, and blistered. A third-degree burn looks white, black, or leathery and, counterintuitively, may not hurt at all because the nerves are destroyed. Here’s how to tell each one apart and what the differences mean for healing.
First-Degree Burns: Red, Dry, No Blisters
A first-degree burn affects only the outermost layer of skin. It looks like a patch of red or reddish-brown skin that feels warm and painful to the touch. The skin stays dry and no blisters form. If you press on the area with your finger, it temporarily turns lighter (this is called blanching), then returns to red when you release.
Sunburns are the most common example. These burns are painful but heal within a few days and rarely leave scars. The skin may peel as it recovers, similar to a bad sunburn fading.
Second-Degree Burns: Blisters and Weeping Skin
A second-degree burn goes deeper, damaging the layer beneath the surface. The key visual marker is blisters. The skin looks pink or red, feels moist or weepy, and still blanches when you press on it. These burns are very painful because the nerve endings in the deeper skin layer are exposed and irritated.
One important thing to know: second-degree burns can worsen substantially over the first 24 hours. A burn that looks manageable right after it happens may deepen overnight as the heat damage continues spreading through the tissue. Deep second-degree burns can eventually require the same treatment as third-degree burns if they don’t heal properly. Partial-thickness burns generally take up to three weeks to heal, and deeper ones carry a higher risk of scarring.
Third-Degree Burns: Leathery, Discolored, Painless
A third-degree burn destroys both layers of skin entirely, including nerve endings, sweat glands, and hair follicles. The appearance is distinctly different from lighter burns: the skin looks white, black, or bright red and feels dry and leathery. It won’t blanch when pressed.
The most telling sign is the lack of immediate pain. Because the nerves are destroyed, the burned area itself feels numb. You’ll likely still feel pain around the edges of the burn, where the tissue transitions to less damaged skin. Third-degree burns take more than three weeks to heal and almost always require medical treatment, often including skin grafting, because the skin can no longer regenerate on its own.
Fourth-Degree Burns: Beyond the Skin
Fourth-degree burns extend through both skin layers and into deeper tissue, potentially reaching muscle, tendon, or bone. Like third-degree burns, there is no feeling in the area because the nerve endings are completely destroyed. These injuries are life-threatening emergencies that result from prolonged exposure to flames, electrical injury, or similar extreme circumstances.
Quick Comparison by Degree
- First-degree: Red, dry, painful, no blisters. Heals in days.
- Second-degree: Pink/red, wet, blistered, very painful. Heals in up to three weeks.
- Third-degree: White, black, or bright red. Leathery, dry, numb. Heals in more than three weeks, requires medical care.
- Fourth-degree: Involves muscle or bone. Numb. Requires emergency treatment.
Why Burns Are Hard to Judge Yourself
Burn depth is genuinely difficult to assess, even for trained professionals. In hospitals, clinicians sometimes use specialized imaging tools that measure blood flow in the tissue beneath the burn. These optical methods can predict burn depth with over 90 percent accuracy, which tells you something about how unreliable the naked eye can be. At home, you’re working with surface clues only.
A few things make self-assessment tricky. Burns can have mixed depths across the same wound, with second-degree damage in one spot and third-degree in another. The burn may also deepen over the first day or two as inflammation spreads. What looks like a second-degree burn on the evening it happens could look notably worse the next morning. If you’re unsure whether a burn is superficial or deeper, checking again 24 hours later gives you a clearer picture.
How to Estimate Burn Size
Degree tells you depth. Size tells you severity. Both matter. The standard method for estimating how much skin is affected assigns percentages to different body regions. In adults, the head and neck account for about 9% of total body surface area, each arm is 9%, each leg is 18%, and the front and back of the torso are each 18%. In infants, the head is proportionally much larger at about 21%, and the limbs are smaller.
A simpler method: your palm, including your fingers, represents roughly 1% of your total body surface area. You can use your hand as a measuring tool to estimate the burn’s coverage.
Burns That Need Emergency Care
Any third- or fourth-degree burn needs professional treatment. For second-degree burns, size and location determine urgency. According to the Mayo Clinic, you should get emergency care if a burn is larger than about 3 inches (8 centimeters) across, affects the face, hands, feet, genitals, buttocks, or major joints like the knees, shoulders, or elbows, or if the burn happened alongside smoke inhalation.
Burns over joints are especially concerning because scar tissue can tighten as it heals, limiting your range of motion. Burns on the hands and face carry higher risks of functional and cosmetic complications.
Signs a Burn Is Getting Infected
Even a properly treated burn can develop an infection. Watch for a partial-thickness burn that appears to be converting into a deeper wound, increasing redness, warmth and swelling spreading into the healthy skin around the burn, or tissue that looks like it’s breaking down. If the wound develops an unusual smell or starts producing discolored discharge, that’s another warning sign. Fever, rapid heart rate, and rapid breathing can indicate a systemic infection, though burns on their own can also produce some of these symptoms due to the body’s inflammatory response.