A really bad sunburn needs immediate, aggressive cooling and anti-inflammatory care to limit skin damage and reduce pain. The first few hours after sun exposure are critical. What you do (and avoid doing) during that window shapes how quickly your skin heals and whether you develop complications like infection or scarring.
Cool the Skin Down Right Away
Get out of the sun and into a cool environment as soon as you notice the burn developing. Run a cool (not cold) bath or drape cool, damp washcloths over the burned areas. Ice and ice-cold water can shock already-damaged skin, so aim for a temperature that feels soothing rather than sharp. You can repeat cool compresses throughout the day as needed.
A colloidal oatmeal bath is another option that helps calm inflammation. You can find colloidal oatmeal packets at most drugstores. Soak for 15 to 20 minutes, then pat your skin dry gently rather than rubbing with a towel.
Take a Pain Reliever Early
Take ibuprofen as soon as possible after getting too much sun. Ibuprofen is the better choice over acetaminophen for sunburn because it reduces both pain and inflammation, while acetaminophen only addresses pain. A bad sunburn is, at its core, an inflammatory response, so targeting that inflammation makes a meaningful difference in swelling, redness, and discomfort. Acetaminophen is a reasonable backup if you can’t take ibuprofen.
Choose the Right Topicals
Once your skin is cool and dry, apply a moisturizer containing aloe vera or soy. Both ingredients help soothe burned skin and support the moisture barrier as it starts to repair. Calamine lotion can also help with itching and irritation. Reapply moisturizer frequently over the next several days, especially after bathing.
One important caution: avoid any spray or cream containing benzocaine or lidocaine. These topical numbing agents should not be applied to burns or broken skin. Benzocaine in particular gets absorbed more readily through damaged skin, raising the risk of a rare but serious blood condition called methemoglobinemia. Stick with aloe-based moisturizers, calamine, or a simple fragrance-free lotion instead.
How to Handle Blisters
Blisters mean the burn has reached deeper layers of your skin. This is essentially a second-degree burn. The single most important rule is to leave them intact. Popping blisters removes your body’s natural bandage and opens the door to infection.
Keep blistered areas clean and apply petroleum jelly to protect them while they heal. If a blister breaks on its own, gently clean the area with mild soap and water, apply petroleum jelly, and cover it loosely with a non-stick bandage. Watch for signs of infection over the following days: increasing redness, warmth, pus, or red streaks spreading from the area.
Drink More Water Than You Think You Need
A severe sunburn pulls fluid toward the skin’s surface and away from the rest of your body. This creates a real risk of dehydration, even if you weren’t particularly dehydrated before the burn. Drink water consistently throughout the day and evening. If you’re also dealing with nausea, vomiting, or dizziness, an electrolyte drink can help replace what your body is losing. Severe burns can cause fluid and electrolyte imbalances significant enough to require hospitalization, so staying on top of hydration is not optional.
Sunburn vs. Sun Poisoning
A standard bad sunburn causes redness, swelling, tenderness, and skin that feels hot to the touch. These symptoms typically peak within 24 to 48 hours and then start fading. Sun poisoning, while not a formal medical diagnosis, describes a sunburn severe enough to produce symptoms that go deeper than the skin.
With sun poisoning, you may experience blisters, severe pain, headache, nausea and vomiting, fever and chills, dizziness, fatigue, or a rapid heartbeat. The key difference is that these are systemic symptoms, meaning your whole body is reacting, not just the burned skin. Sun poisoning also lasts longer than a typical sunburn.
When a Sunburn Needs Medical Attention
Most sunburns, even painful ones, heal on their own. But certain signs mean you need medical care right away:
- Blisters covering more than 20% of your body (roughly a whole leg, your entire back, or both arms)
- Fever above 102°F (39°C)
- Chills or extreme pain that over-the-counter medication can’t control
- Signs of dehydration: dizziness, dry mouth, fatigue, dark urine, or reduced urination
- Signs of infection: pus from blisters, increasing redness, or red streaks
Any sunburn on a baby under one year old also warrants immediate medical treatment.
What the Healing Timeline Looks Like
A mild to moderate sunburn typically heals in 3 to 5 days. A really bad sunburn takes longer. Peeling usually begins a few days after the burn and can last about a week, though small amounts of skin may continue to shed for days or even weeks after that.
Resist the urge to peel or pick at flaking skin. The peeling is your body shedding its damaged outer layer, and pulling it off prematurely exposes raw skin underneath that isn’t ready for the elements. Keep moisturizing, stay out of the sun entirely until the burn has fully healed, and wear loose, soft clothing over the affected areas. Tight or rough fabric against a bad burn adds friction that slows healing and increases pain.
Your skin will be more sensitive to UV exposure for weeks after a severe burn, even once it looks and feels normal again. When you do go back outside, cover previously burned areas with clothing or use a broad-spectrum sunscreen with SPF 30 or higher.