A mild sunburn typically heals in 3 to 5 days, while a moderate burn with peeling takes about a week. Severe sunburns with blistering can take two weeks or longer to fully recover. The exact timeline depends on the depth of skin damage and how well you care for the burn during recovery.
Mild Sunburn: 3 to 5 Days
A first-degree sunburn affects only the outer layer of skin. It looks red, feels warm and tender, and may sting when touched. Redness and pain typically peak somewhere between 12 and 24 hours after sun exposure, which is why a burn can seem to “get worse” even after you’ve come inside. Over the next few days, the redness fades, tenderness eases, and the skin returns to normal without any peeling or lasting marks.
Moderate Sunburn: 5 to 10 Days
A deeper burn that triggers peeling follows a slightly longer arc. For the first day or two, the skin is red, swollen, and painful. Around day three, as the swelling starts going down, the outer layer of dead skin cells no longer fits snugly over the healing tissue underneath. Instead of shrinking with the rest of your skin, it separates and peels away.
Peeling can continue for a week or more depending on severity. It usually starts in the areas that were burned worst and gradually works outward. The new skin underneath is more sensitive to UV light, so it burns more easily if you go back out unprotected. Once peeling wraps up, the skin may look slightly uneven in tone for a few additional days before it fully normalizes.
Severe or Blistering Sunburn: Up to 2 Weeks or More
A second-degree sunburn reaches the deeper middle layer of skin (the dermis) and produces fluid-filled blisters. These blisters are the body’s way of cushioning damaged tissue while it heals underneath. Recovery from a blistering sunburn takes up to two weeks, and severe cases can stretch beyond that.
Leave blisters intact. Popping them removes that protective barrier and opens the raw skin beneath to bacteria. If blisters become extremely large or you notice pus, red streaks, or increasing warmth around them, that suggests infection, which needs medical treatment. Once blisters drain and dry on their own, the area will peel and gradually return to its normal color over the following week or two.
What Happens Inside Your Skin During Healing
UV radiation doesn’t just redden the surface. It damages DNA inside skin cells. Your body has a built-in repair system that scans for and fixes these defects, but the process isn’t instant. The half-life of UV-induced DNA damage is 20 to 30 hours, meaning it takes roughly a full day for your cells to repair even half the damage. Research from the University of Queensland found that almost 25% of the DNA damage detected 24 hours after sun exposure was still present at the 72-hour mark. Your skin eliminates most of it over a few days, but the repair window extends well beyond the point where the burn stops hurting.
When a cell sustains too much damage to fix, the body’s monitoring system tells it to self-destruct and sends immune cells to clean up. This is part of why sunburned skin feels inflamed and sore: your immune system is actively working to remove wrecked cells and replace them with healthy ones.
Sun Poisoning Takes Longer
A severe burn can come with systemic symptoms that go beyond skin pain. Headache, fever, chills, nausea, dizziness, and confusion are all signs of what’s commonly called sun poisoning. These symptoms are largely driven by severe dehydration and widespread inflammation. Pain and skin healing from sun poisoning can continue for a few weeks. The flu-like symptoms usually ease within a few days as you rehydrate, but the skin itself takes the longest to recover.
How to Speed Up Recovery
You can’t dramatically shorten the biological repair timeline, but you can avoid slowing it down. The American Academy of Dermatology recommends frequent cool baths or showers to bring down skin temperature and reduce pain. When you get out, pat dry gently rather than rubbing. While your skin is still damp, apply a moisturizer containing aloe vera or soy to lock in hydration and soothe inflammation. Reapply whenever the skin feels tight or uncomfortable.
Drinking plenty of water matters more than people realize. A sunburn draws fluid toward the skin surface and away from the rest of your body. Staying well-hydrated helps support the skin’s healing process from the inside. Over-the-counter pain relievers can help manage discomfort during the first couple of days when pain peaks.
What you should avoid: don’t peel flaking skin, don’t pop blisters, and don’t apply petroleum-based products or butter, which can trap heat. Stay out of the sun entirely until the burn heals. The new skin forming underneath is thinner and far more vulnerable to UV damage.
Color Changes That Linger After Healing
Even after a sunburn feels completely healed, some people notice darker or lighter patches where the burn was worst. This post-burn pigment change can last months. In most cases, it fades gradually on its own, but some discoloration from severe burns can become permanent, particularly on the face or areas with repeated sun damage. Wearing sunscreen on healing and recently healed skin helps prevent these pigment shifts from worsening.
Signs That Need Medical Attention
Most sunburns heal on their own, but certain symptoms signal something more serious. According to the Mayo Clinic, you should seek medical care if you develop large blisters (especially on the face, hands, or genitals), experience severe swelling, notice signs of infection like pus or red streaks, or have worsening pain and headache that don’t respond to home care. A fever above 103°F (39.4°C) with vomiting, confusion, or signs of dehydration requires immediate medical attention.