Sunburn is an injury to the skin from ultraviolet light. The redness and pain are the body clearing away damaged cells, which is why they arrive hours after the exposure rather than during it. The skin heals in about a week. Some of the DNA damage underneath does not. Sun allergy is a common name for several light-related rashes; polymorphic light eruption is one common pattern.
The same eight facts on every condition comparison.
Redness Hot, tender skin in sun-exposed areas.
Blisters Fluid-filled blisters in severe burns.
Peeling Skin flaking as it heals.
Sun Allergy Small pink-red spots are distributed along the exposed arm.
Excess ultraviolet exposure injures skin cells and triggers inflammation. Increased blood flow and swelling cause soreness and warmth, and damaged surface cells may later peel away.
In polymorphic light eruption, ultraviolet exposure triggers an abnormal inflammatory response in the skin. This produces an itchy eruption rather than the direct tissue injury of an ordinary sunburn.
Sunburn. Can occur at any age after enough ultraviolet exposure.
Sun Allergy. Often begins in young adulthood; other light-related conditions have different onset patterns.
Sunburn is damage to skin cells from ultraviolet light. The redness and pain come from the inflammation that follows.
An abnormal inflammatory response to ultraviolet light is involved in polymorphic light eruption.
Fair skin, red hair and freckles mean less natural protection from melanin.
Evidence labels come from each condition’s own treatment list.
An anti-inflammatory painkiller works on the actual mechanism of a sunburn, which is inflammation, and it helps most when it is started in the first few hours rather than added on day two. Take it regularly for the first day or so rather than only when the pain peaks. If you are pregnant or breastfeeding, ask the doctor managing your pregnancy which pain relief is appropriate.
One percent hydrocortisone can take the edge off a small, sore area for a few days. Use it on unbroken skin only, never on blisters or open areas, and not over large parts of the body. It is a mild help rather than a fix, and if the burn is big enough that you want to cover it all, that is a burn worth having looked at.
Benzocaine and lidocaine sprays sold for sunburn cause allergic rashes on inflamed skin often enough that they are not worth using. The relief is short, and an allergic reaction on top of a burn is a considerably worse week. Cool compresses and an anti-inflammatory painkiller do the same job without that risk.
Cooling and pleasant on a burn, and it is what most people reach for first. The trial evidence that it does anything beyond that is thin. Keep it in the fridge if you like it, choose a plain gel without added fragrance or alcohol, and do not expect it to shorten anything. It is comfort, not treatment.
Its job here comes later, on peeling skin and on any blister that has opened, where it stops the new skin drying and cracking and reduces the itch. Use it under a loose non-stick dressing rather than an adhesive one. It is not for the first day on an intact, hot burn, where a thick greasy layer traps heat and makes things feel worse.
A stronger steroid cream, sometimes prescribed for a few days on a severe burn that hydrocortisone has not touched. It reduces the inflammation and the soreness a little. It does not change how long the burn lasts or repair any of the damage underneath, and it goes on unbroken skin only, never on blisters or open areas.
An antibiotic ointment for the specific situation where broken blisters have become infected, which shows as increasing redness, swelling, heat or pus. It is not for a plain burn and does nothing for one. If the infection is spreading beyond the burnt area, antibiotic tablets are needed instead.
May reduce an active eruption after the cause of photosensitivity is assessed.
The worst of a sunburn arrives after you have gone indoors. Nothing makes it heal faster - aftercare makes the week bearable and prevents complications, but does not undo the injury. The DNA damage does not fully reverse, and repeated burns, particularly in childhood and adolescence, contribute to actinic keratoses, squamous cell carcinoma, basal cell carcinoma and melanoma decades later.
Light-related rashes have different courses, so the diagnosis matters. Polymorphic light eruption can recur after sun exposure, often seasonally; sun protection helps reduce further episodes.
Blisters that get infected
A blister means the injury went deeper into the skin. An intact blister is a sterile cover over an open wound, and popping one lets bacteria in and can turn a burn that would have healed cleanly into one that scars. Leave them alone. If one opens by itself, keep it clean, use plain petrolatum and a non-stick dressing, and get it looked at if the area becomes hot, swollen or starts oozing pus.
Heat illness and dehydration
A large burn is not only a skin problem. Fever, chills, headache, nausea, weakness, dizziness and intense thirst come from a big area of inflamed skin losing fluid alongside hours in the heat. It is often called sun poisoning, which it is not. Children and older adults reach this point sooner. It needs shade, fluids and, if there is confusion, fainting, vomiting or very little urine, same-day medical care.
Skin cancer decades later
This is the complication that never looks like one at the time. Repeated blistering sunburns, particularly in childhood and adolescence, are associated with a substantially higher risk of melanoma later, and ordinary cumulative exposure drives most other skin cancers. No amount of aftercare undoes it. It is why a pattern of burning every summer is worth a conversation, and why a history of repeated burns is a reason to arrange a skin check.
Medicines and other diseases can also cause light sensitivity, so diagnosis matters.
Get prompt help for extensive blistering, dehydration, fever or severe pain; babies and young children need a lower threshold for assessment.
Seek care for severe blistering, systemic symptoms or a rash after starting a new medicine.
Redness appears within two to six hours, peaks around twelve to twenty-four hours, and settles over three to seven days, with peeling toward the end. Blistering burns take longer and can leave marks for months. Nothing shortens it.
Not really. Peeling is dead skin being shed; the damage is already done. Moisturizer reduces itching and cracking. Do not pull the flakes off - that exposes tender new skin.
No. An intact blister is a sterile cover over an open wound and lowers the risk of infection and scarring. If one opens, keep it clean, use plain petrolatum and a non-stick dressing, and have it checked if the area becomes hot, swollen or oozes pus.
Each burn adds to a lifetime total rather than deciding anything on its own. Repeated blistering sunburns, particularly in childhood and adolescence, carry a substantially higher risk of melanoma. Ordinary cumulative exposure drives most other skin cancers.
Usually a medicine that increases sensitivity to ultraviolet light - some antibiotics, diuretics, anti-inflammatories, retinoids and others. Plant sap, especially lime juice, does the same in streaks, and recent peels or laser lower the threshold. Ask a pharmacist rather than stopping any prescribed medicine yourself.
No. A tanning bed delivers a concentrated dose of ultraviolet light and causes the same DNA damage. Using one before the age of 35 carries a notably higher risk of melanoma. The tan is the injury response, so no version of deliberate tanning avoids it.
Sun allergy is a common name for several light-related rashes; polymorphic light eruption is one common pattern.
Use broad-spectrum sunscreen, protective clothing and shade; avoid deliberate sun exposure as treatment.
Seek care for severe blistering, systemic symptoms or a rash after starting a new medicine.
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