A mild sunburn typically heals in 3 to 7 days. More severe sunburns with blistering can take one to three weeks. The exact timeline depends on how deep the burn goes, how much skin is affected, and your natural skin tone.
The First 72 Hours
Sunburn doesn’t hit all at once. Redness and pain usually begin within a few hours of sun exposure, but the worst of it comes later. Skin inflammation peaks at 24 to 36 hours after you were in the sun, which is why a sunburn often looks and feels much worse the next morning than it did at the beach.
During this window, your skin cells are scrambling to repair DNA damage from UV radiation. It takes 20 to 30 hours for your cells to fix even half the damage, and research from the University of Queensland found that nearly 25% of the DNA damage detected at the 24-hour mark was still present at 72 hours. Your body clears most of this damage over a few days, but the repair work is happening well beneath what you can see or feel on the surface.
By around day three, the initial redness and swelling in a mild burn start to fade. For mild to moderate sunburns, this is the turning point where symptoms begin improving noticeably.
Mild vs. Severe Sunburn
How long your sunburn lasts depends largely on which layer of skin was damaged.
A first-degree sunburn affects only the outer layer of skin. It causes redness, tenderness, and warmth, and it generally resolves on its own within a few days to a week. This is the most common type, the one you get from a slightly-too-long afternoon outside.
A second-degree sunburn reaches deeper into the skin and produces blisters. These burns are more painful and take significantly longer to heal, anywhere from one to three weeks depending on how large the affected area is and where it’s located. Blistered skin on areas that flex or rub against clothing (like shoulders or the backs of knees) tends to heal more slowly.
When Peeling Starts
Peeling is your body shedding its damaged outer layer, and it’s actually a sign of healing. It typically begins about three days after the burn. As the swelling underneath goes down, the dead outer layer of skin no longer fits snugly over the healthy tissue below, so it separates and flakes off.
The peeling process itself can last a week or longer for more severe burns. As tempting as it is, pulling off peeling skin before it’s ready can expose raw tissue underneath and increase the risk of infection. Let it come off on its own.
Hell’s Itch
Some people develop an intense, deep itching one to three days after a sunburn, most often on the upper back and shoulders. This is sometimes called “hell’s itch,” and it’s not the mild itchiness of healing skin. It feels more like a throbbing, painful itch that comes in waves and can be genuinely distressing.
The good news is that it typically resolves within 48 hours. Cool compresses and over-the-counter antihistamines can take the edge off while you wait it out.
How Skin Type Affects Recovery
Your natural skin tone plays a significant role in both how easily you burn and how the burn progresses. Dermatologists classify skin into six types on the Fitzpatrick scale. People with Type I skin (very fair, often with red hair and freckles) are the most vulnerable. They always burn, never tan, and are more likely to experience blistering and peeling even from moderate sun exposure. Type II skin burns easily and tans minimally. Types III and IV burn occasionally and tan more readily, while Types V and VI rarely or never burn.
If you have lighter skin, expect the full cycle of redness, pain, peeling, and fading to take longer than someone with a darker complexion who got the same amount of sun. Lighter skin types also tend to develop more intense inflammation at the peak, which extends the overall recovery window.
Aloe Vera and Other Remedies
Aloe vera is the go-to sunburn remedy for most people, but it’s worth knowing what it can and can’t do. Multiple studies have found that aloe vera is no more effective than a placebo at actually healing sunburn. It won’t reverse UV damage or speed up recovery. What it does do is cool and moisturize irritated skin, which can make the experience more bearable while your body does the real repair work.
The same applies to most over-the-counter sunburn treatments. Cool baths, fragrance-free moisturizers, and staying hydrated all help with comfort. But time is the only true healer for a sunburn. Nothing you apply topically will shorten the timeline by a meaningful amount.
Sun Poisoning
Severe sunburns can trigger systemic symptoms that go beyond skin damage. If you develop a fever, chills, headache, nausea, dizziness, or extreme fatigue after sun exposure, that’s sometimes called sun poisoning. These symptoms last longer and are more intense than a standard sunburn, and they signal that the UV damage was significant enough to affect your whole body.
Seek medical attention if you develop a fever above 102°F, blisters covering a large area of your body (an entire leg, your whole back, or both arms), signs of dehydration like dizziness and reduced urination, or pus seeping from blisters. Sunburn in a baby under one year old also warrants immediate medical care.