Most mild sunburns last about 3 to 7 days. Pain typically peaks around 24 hours after sun exposure, redness fades over the next few days, and any peeling wraps up within a week. More severe burns with blisters can take two weeks or longer to fully heal, and the recovery process looks different at each stage.
The Day-by-Day Timeline
Sunburn doesn’t hit all at once. You might feel fine stepping out of the sun, but pain usually begins within a few hours and keeps building. Redness and irritation peak at roughly the 24-hour mark, which is why a burn often looks and feels worse the morning after.
Over the next two to three days, the acute symptoms of a mild to moderate burn start to fade. The hot, tender feeling gradually eases, and the deep redness shifts to a duller pink. Around day three, swelling begins to subside, and that sets the stage for peeling. Your outer layer of dead skin cells doesn’t shrink along with the healthy tissue underneath, so it separates and flakes off. This peeling phase can last another week or more depending on how severe the burn was.
Here’s a rough breakdown for a typical mild-to-moderate sunburn:
- Hours 0–6: Redness appears and pain begins
- Hours 6–24: Pain and redness intensify, reaching their peak
- Days 2–3: Pain starts easing, swelling goes down
- Days 3–7: Peeling begins as damaged skin sheds
- Days 7–14: New skin is revealed, color gradually returns to normal
Severe Burns and Sun Poisoning Take Longer
If your sunburn produces blisters, you’re dealing with a second-degree burn, and the timeline stretches considerably. Blistering burns can take two weeks or more to heal and often come with systemic symptoms that a mild burn doesn’t cause: headache, nausea, vomiting, fever, and chills. These signs are sometimes called “sun poisoning,” and they indicate your body is reacting to significant tissue damage, not just surface irritation.
Large blisters (bigger than about half an inch), blisters on the face, or many small blisters clustered together are worth a call to your doctor. The same goes for fever above 104°F, signs of infection like spreading redness or pus, or pain that doesn’t respond to home care.
What’s Happening Under the Surface
Even after the redness fades and peeling stops, your skin is still doing repair work at the cellular level. UV radiation damages DNA inside skin cells, and your body’s repair machinery needs time to fix those defects. The half-life of UV-induced DNA damage is roughly 20 to 30 hours, meaning it takes that long for your cells to fix just half of it. One study found that nearly 25% of the DNA damage detected at 24 hours was still present at 72 hours. Most of the damage gets cleaned up within a few days, but some errors can slip through before a cell divides, which is part of why sunburns contribute to skin cancer risk over time.
Why New Skin Stays Vulnerable
Once peeling is complete, the fresh skin underneath is thinner than normal and significantly more sensitive to UV light. This heightened vulnerability lasts for several weeks. During that window, even brief sun exposure can cause another burn more easily than usual. Protecting recently healed skin with clothing or sunscreen is important until it has had time to fully mature.
Treatments Ease Pain but Don’t Speed Healing
No over-the-counter product shortens the actual healing timeline of a sunburn. What treatments can do is make the days of recovery more comfortable. Aloe vera gel and calamine lotion soothe irritation. A low-strength hydrocortisone cream (1%) applied three times a day for up to three days can reduce swelling and discomfort for mild to moderate burns. Cool compresses and anti-inflammatory pain relievers also help manage the worst of it.
Keeping burned skin moisturized matters during the peeling phase. Resist the urge to pull or peel flaking skin yourself. That dead layer is protecting the new, fragile skin forming underneath, and removing it prematurely can slow things down or cause scarring.
Children’s Skin and Long-Term Effects
Kids don’t necessarily heal from sunburns on a dramatically different schedule than adults, but the stakes are higher. Most cumulative sun damage happens during childhood, and even moderate burns in early years contribute to wrinkling, freckling, and skin cancer risk later in life. Babies under six months should be kept out of direct sunlight entirely, since their skin is especially thin and vulnerable. For older children, the same healing timeline applies, but preventing the burn in the first place carries outsized importance for their long-term skin health.