Severe sunburn needs immediate cooling, aggressive hydration, and careful skin protection over the days that follow. The first few hours matter most: taking an anti-inflammatory pain reliever and cooling the skin as soon as possible can reduce the intensity of the reaction before it peaks, which typically happens 12 to 24 hours after sun exposure.
Cool the Skin Immediately
Apply a clean towel dampened with cool tap water to the burned areas for about 10 minutes at a time, repeating several times throughout the day. A cool bath also works. Adding about two ounces of baking soda to the tub can help soothe irritation. Avoid ice or ice-cold water directly on the skin, which can cause further damage to tissue that’s already inflamed.
After cooling, apply aloe vera gel or a plain moisturizing lotion while the skin is still slightly damp to help lock in moisture. Refrigerating the product beforehand adds extra relief. For areas that are intensely red and inflamed, a nonprescription 1% hydrocortisone cream applied three times a day for up to three days can reduce swelling and discomfort.
Manage Pain Early
Take ibuprofen or acetaminophen as soon as you realize you’re burned. Ibuprofen is the better choice if you can tolerate it, because it reduces inflammation in addition to blocking pain. Research on UV-induced inflammation shows that anti-inflammatory medications are most effective when taken promptly after exposure, particularly within the first six hours, before the burn reaches peak intensity. Waiting until the pain becomes severe means you’ve already missed the window where these medications do the most good.
That said, even at optimal doses, oral anti-inflammatories produce only a mild reduction in sunburn redness. They take the edge off, but they won’t make a severe burn feel minor. Treat them as one tool alongside cooling and moisturizing, not a standalone fix.
What to Avoid Putting on Your Skin
Skip products containing alcohol, which strips moisture from skin that’s already dehydrated and damaged. Avoid topical anesthetics like benzocaine, sometimes marketed specifically for sunburn relief. There’s little evidence they work, and they can irritate burned skin further. Benzocaine has also been linked to a rare but serious condition that reduces the blood’s ability to carry oxygen.
Butter, cooking oils, and petroleum jelly are common home remedies that actually make things worse. These substances trap heat in the skin, slowing the cooling process and potentially deepening the injury. Stick with water-based lotions and aloe vera.
Drink More Water Than You Think You Need
A severe sunburn pulls fluid toward the skin’s surface, which means the rest of your body becomes dehydrated faster than normal. You may not feel particularly thirsty at first, but your fluid needs are significantly elevated. Drink water steadily throughout the day and for several days after the burn. If you notice dark urine, dizziness, dry mouth, or reduced urination, those are signs dehydration is already setting in.
Sports drinks or electrolyte solutions can help if you’re also dealing with nausea or have been sweating heavily. The combination of sun exposure, heat, and burned skin creates a triple drain on your body’s fluid and mineral balance.
How to Handle Blisters
Blisters mean the burn has reached the second layer of skin. Do not pop them. The intact blister acts as a natural sterile bandage, protecting the raw skin underneath from bacteria. If a blister breaks on its own, gently clean the area with mild soap and water, apply a thin layer of antibiotic ointment, and cover it loosely with a nonstick bandage.
Watch broken blisters closely for signs of infection: increasing redness that spreads beyond the blister’s edge, pus or cloudy drainage, worsening pain rather than gradual improvement, or red streaks radiating outward. Infected sunburn blisters need medical treatment.
When Sunburn Needs Emergency Care
Most sunburns, even painful ones, heal on their own. But certain signs mean you need medical attention right away:
- Extensive blistering covering more than 20% of your body, roughly equivalent to an entire leg, your whole back, or both arms
- High fever above 102°F (39°C), especially with vomiting or confusion
- Signs of dehydration that don’t improve with fluids: dizziness, extreme fatigue, very little urination
- Chills or extreme pain that over-the-counter medication can’t control
- Eye pain or vision changes from sun-exposed eyes
- Any sunburn on a baby younger than one year old
Confusion is a particularly urgent warning sign. It can indicate heat stroke, which is a medical emergency requiring immediate care.
What Recovery Looks Like
A second-degree sunburn (one with blisters) typically takes one to three weeks to heal, moving through three distinct phases. First comes the inflammatory reaction: swelling, deep redness, and pain as your immune system responds. This phase is most intense in the first 24 to 72 hours.
Next, your body begins repairing the damage beneath the surface. Cells clear out destroyed tissue and make room for new skin to grow. This is when peeling starts, as dead skin cells shed from the burn site. Resist the urge to pull or pick at peeling skin. Forcing it off can tear healthy tissue underneath and increase the risk of scarring.
The final phase is remodeling, when your body fills gaps in the damaged tissue with collagen. This can leave behind lighter patches or mild scarring, particularly if blisters were deep or became infected. Keeping the skin moisturized throughout the entire healing process supports all three stages.
Protecting Healing Skin From Further Damage
Freshly burned skin is extremely vulnerable to additional UV damage, and re-burning healing skin can cause lasting pigment changes and scarring. Stay out of direct sun entirely until the burn has fully healed. When you do need to go outside, cover the area with clothing.
Not all fabrics offer meaningful protection. Loosely woven summer fabrics like gauze and linen let UV radiation pass right through. The best protection comes from tightly woven fabrics with high thread counts in dark or bright colors, which absorb light rather than letting it through. Polyester, nylon, and lightweight wool are strong choices. Make sure clothes fit loosely, since stretching opens gaps between fibers that allow UV through, and tight fabric against a burn is painful anyway. Wet clothing also loses much of its UV-blocking ability, so keep the covering layer dry.
Once the skin has fully healed, it will remain more sensitive to sun for weeks to months. Use broad-spectrum sunscreen with an SPF of at least 30 on any previously burned areas whenever you’re outdoors, even on cloudy days.