A sunburn radiates heat because your skin is inflamed, with blood vessels dilating and fluid rushing to the damaged area. The burning sensation starts within a few hours of sun exposure and peaks around 24 hours later, so acting quickly makes a real difference. Here’s how to pull that heat out and keep it from getting worse.
Cool the Skin Down Immediately
A cool bath or shower is the fastest way to drop your skin’s temperature. The water should feel comfortably cool, not ice cold. Cold water or ice packs can shock inflamed skin and cause further irritation, so aim for something gentle. Keep it short. Spending too long in water strips moisture from skin that’s already damaged and dehydrated.
If you can’t get to a shower, cool compresses work well. Soak a soft cloth in cool water, wring it out, and lay it over the burned area until your skin feels cooler to the touch. You can repeat this as often as needed throughout the day, re-wetting the cloth each time.
Take a Pain Reliever Early
Over-the-counter anti-inflammatory pain relievers like ibuprofen are most helpful when taken as soon as possible after you realize you’ve been burned. They work by dialing down the inflammatory response that’s generating all that heat and pain. If you wait until the burn is fully developed the next day, you’ll still get some pain relief, but you’ll have missed the window when reducing inflammation matters most. Acetaminophen can help with pain but won’t target the inflammation itself.
Moisturize While Skin Is Still Damp
After your cool bath or shower, pat your skin gently with a towel and apply a moisturizer while your skin is still slightly damp. This locks in water and helps prevent the tight, dry feeling that makes a burn feel even hotter hours later.
Aloe vera gel is one of the best options here. It has natural anti-inflammatory properties that ease redness and swelling, it’s rich in antioxidants like vitamins C and E that help reduce skin stress, and its high water content acts as a hydrating layer that may limit peeling later on. Look for pure aloe vera gel, ideally one you’ve kept in the refrigerator for an extra cooling effect. Fragrance-free moisturizers with soy are another solid choice for calming inflamed skin.
What Not to Put on a Sunburn
Avoid anything containing petroleum, benzocaine, or lidocaine. Petroleum-based products trap heat in the skin, which is the opposite of what you want. Benzocaine and lidocaine, though marketed as numbing agents, can irritate already-damaged skin and sometimes cause allergic reactions. Butter, coconut oil, and other heavy oils have the same heat-trapping problem as petroleum. Stick with lightweight, water-based products.
Hydrate From the Inside
A sunburn draws fluid toward your skin’s surface as part of the inflammatory response, which can leave the rest of your body mildly dehydrated. Drink more water than you normally would for the first couple of days. If you feel thirsty, you’re already behind. Dehydration slows healing and can make you feel worse overall, especially if you also spent a long day in the heat.
What to Expect Over the Next Few Days
The timeline of a sunburn follows a predictable pattern. Redness and heat start within a few hours of UV exposure, typically becoming most intense 12 to 24 hours later. That first night is usually the worst. A first-degree burn, where only the outer layer of skin is damaged, generally heals on its own within a few days to a week. Peeling often begins around day three or four as your body sheds the damaged cells.
During this time, keep reapplying moisturizer, stay out of the sun, and wear loose, soft clothing over the burned area. Tight fabrics generate friction heat and slow recovery. If you need to go outside, cover the burn with clothing rather than applying more sunscreen to raw skin.
Leave Blisters Alone
If your burn blisters, that indicates a second-degree burn where deeper layers of skin are involved. Leave closed blisters intact. They’re acting as a natural bandage, and breaking them open invites infection. If a blister breaks on its own, gently trim the dead skin with clean scissors and keep the area clean.
Contact a doctor within 24 hours if you develop large blisters (bigger than about half an inch), many small blisters clustered together, or any blisters on your face. Signs of infection include pus, red streaks spreading outward from the burn, or pain that gets worse after the second day rather than better.
Signs You Need Medical Attention
Most sunburns are painful but manageable at home. A severe burn, sometimes called sun poisoning, is different. Seek medical care if you develop a fever, feel extremely cold or start shivering, or experience nausea, vomiting, or a headache alongside bright red, oozing skin. These symptoms mean the UV damage has triggered a systemic response beyond just your skin, and you may need professional treatment to manage it safely.