A bad sunburn typically lasts one to three weeks, depending on severity. A first-degree burn (red, painful, no blisters) usually heals in a few days to a week. A second-degree burn with blisters can take several weeks to fully resolve, and lingering skin discoloration may persist for months after the burn itself has healed.
The First 72 Hours
Sunburn doesn’t hit its worst point while you’re still outside. Redness and pain peak roughly 8 to 12 hours after UV exposure, which is why a burn that seemed mild at the beach can feel brutal by bedtime. Over the next 24 to 48 hours, swelling increases, skin feels hot and tight, and the full extent of the damage becomes visible. By day three, you’re usually past the worst of the acute pain, though the skin remains tender to the touch.
Taking an over-the-counter anti-inflammatory like ibuprofen as soon as possible after sun exposure can reduce swelling and ease pain during this window. A low-dose hydrocortisone cream applied to the skin three times a day for up to three days can also help with discomfort. Neither of these treatments speeds up actual healing. They manage symptoms while your body does the repair work underneath.
First-Degree Burns: Days to a Week
Most sunburns fall into this category. The skin turns red, feels sore, and may be warm to the touch, but there are no blisters. This type of burn damages only the outermost layer of skin and generally heals on its own within a few days to a week. Peeling often starts around day three or four as the body sheds the damaged cells. The peeling itself can last a few more days, and the new skin underneath may look slightly lighter or pinker than the surrounding area for a short time.
Cool (not cold) compresses, frequent moisturizer, and staying hydrated help keep you comfortable during this phase. Avoid peeling off loose skin manually, as pulling it can tear healthy tissue underneath and slow healing.
Second-Degree Burns: Weeks to Heal
A “bad” sunburn often means blisters, and blisters mean the damage has reached the second layer of skin, called the dermis. Second-degree sunburns look deep red to dark brown, with shiny, moist skin and noticeable swelling. The pain is significantly worse than a standard burn, and layers of skin may peel away on their own.
These burns can take weeks to heal. Small blistered areas (less than about three inches across) can generally be managed at home with gentle wound care and keeping the area clean and moisturized. Larger blistered areas, or burns covering a significant portion of your body, warrant medical attention. Don’t pop blisters. They act as a natural bandage, protecting the raw skin beneath from infection.
Signs of infection include blisters that fill with pus or red streaks spreading outward from the burn. If you notice either, that’s a reason to get medical care promptly.
Sun Poisoning: When Symptoms Go Beyond Skin
Severe UV overexposure can trigger systemic symptoms that go beyond the burn itself: fever, chills, nausea, headache, and dizziness. This is sometimes called “sun poisoning,” though it’s not an actual poisoning. These whole-body symptoms typically develop within a few hours of exposure and can last longer and feel more intense than a standard sunburn. You may feel genuinely sick, almost flu-like, for a day or two while the skin symptoms run their separate, longer course.
Why Skin Color Changes Can Linger for Months
Even after the pain, peeling, and tenderness are gone, many people notice that the formerly burned area looks different from the rest of their skin. This is post-inflammatory hyperpigmentation, a darkening or mottling that occurs when damaged skin produces excess pigment during the healing process. It’s more common and more visible in people with medium to dark skin tones, but it can happen to anyone after a bad burn.
This discoloration typically fades on its own, but the timeline is slow: anywhere from 3 to 24 months. In some cases it takes even longer. Topical treatments can help speed the process, but even with treatment, expect at least 8 to 12 weeks before seeing meaningful improvement. The most important thing you can do during this period is protect the affected area from further sun exposure, since UV light will darken the pigmentation and reset the clock.
What Affects How Long Your Burn Lasts
Not all bad sunburns heal on the same schedule. Several factors influence your personal timeline:
- Burn depth and area: A blistering burn across your entire back will take significantly longer to heal than one on your nose. Larger surface area means more tissue to repair and a greater inflammatory response.
- Skin tone: Lighter skin burns more easily and at greater depth from the same UV exposure, which can mean a longer recovery.
- Location on the body: Thin-skinned areas like the tops of your feet, chest, and shoulders tend to burn more severely and heal more slowly than thicker-skinned areas.
- How you care for it: Keeping burned skin cool, moisturized, and protected from further sun exposure supports faster healing. Continued sun exposure on already-burned skin compounds the damage and extends recovery.
Repeated severe sunburns also accumulate long-term damage that doesn’t show up on any short-term healing timeline. Each blistering burn roughly doubles your lifetime risk of melanoma, so while the immediate discomfort is temporary, the cellular damage is not.