How long does a sunburn take to heal?

A mild sunburn typically heals within 3–5 days. Moderate sunburn with peeling takes 7–10 days, and severe sunburn with blistering can take 2–3 weeks. The face tends to heal fastest due to its rich blood supply, while the legs are often slowest.

Should I put ice on a sunburn?

No. Ice and ice packs can cause frostbite on already damaged skin, converting one injury into another. Use cool (not cold) compresses or take a cool bath instead — this brings the skin temperature down gently without risking further tissue damage.

Does aloe vera actually help sunburn?

Evidence is mixed but modestly supportive. A meta-analysis of burn treatment found aloe vera shortened healing time by roughly 9 days compared to controls. It provides a cooling, anti-inflammatory effect and helps maintain skin hydration. Choose pure aloe vera gel without added alcohol or fragrance for best results.

When should I see a doctor for sunburn?

Seek medical advice if blisters cover a large area of your body, you develop a fever above 39°C (103°F) with nausea or chills, the burn shows signs of infection (increasing pain, swelling, pus, or red streaks), or you feel dizzy or confused. Children with severe sunburn should always be assessed by a doctor.

Can I still tan after getting sunburnt?

You should avoid any further sun exposure until the burn has fully healed — including any peeling. New skin underneath a burn is extremely sensitive and has very little melanin protection. Exposing it to UV too soon dramatically increases the risk of further damage and long-term harm.

Sunburn Aftercare: How to Treat and Recover from Sun Damage

Even the most careful sun-seeker gets caught out sometimes. Perhaps the UV index was higher than forecast, cloud cover broke unexpectedly, or you simply lost track of time. Whatever the cause, once a sunburn has set in, what you do in the first few hours and days makes a genuine difference to how quickly your skin recovers — and how much lasting damage it sustains. This is the evidence-based guide to treating sunburn properly.

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What Is Happening Inside Your Skin

Before reaching for the aftersun, it helps to understand what a sunburn actually is. Sunburn is not simply "hot skin" — it is an acute inflammatory injury triggered by UV-induced DNA damage in your keratinocytes.

When UVB radiation causes cyclobutane pyrimidine dimers (structural distortions in your DNA), the body launches a multi-stage inflammatory response. Within the first hour, mast cells release histamine, serotonin, and TNF-α. Over the following hours, prostaglandin E2 levels rise roughly fourfold, driving the vasodilation that produces visible redness. Neutrophils flood the damaged tissue, and the most severely damaged keratinocytes undergo programmed cell death — these are clinically known as sunburn cells.

This is why sunburn has a delayed onset. The inflammatory cascade takes 4–6 hours to become visible and peaks at 12–24 hours after exposure. You can feel perfectly fine at the beach and badly burnt by evening.

Sunburn Aftercare: The First 24 Hours

The first day is critical. The inflammatory response is still escalating, and the right interventions can meaningfully reduce its severity.

Get out of the sun immediately

This sounds obvious, but many people continue their outdoor activity after noticing mild redness, thinking the damage is already done. It is not — UV exposure is cumulative, and every additional minute adds to the dose. Move indoors or into full shade as soon as you notice any pinkness or warmth.

Take an anti-inflammatory early

Ibuprofen (or another NSAID) taken within the first 2 hours of noticing a burn can reduce the inflammatory cascade before it peaks. NSAIDs have anti-prostaglandin effects that help limit redness, swelling, and pain. The American Academy of Dermatology recommends taking an over-the-counter anti-inflammatory at the first sign of sunburn. If you cannot take NSAIDs, paracetamol will help with pain but does not reduce inflammation.

Cool the skin — but do not use ice

Apply cool, damp compresses to the affected area, or take a cool (not cold) bath. Adding baking soda (about 60 g per bath) can help soothe the skin. Do this for about 10 minutes at a time, several times throughout the day.

Never apply ice or ice packs directly to sunburnt skin. Ice can cause frostbite on already damaged tissue, converting one injury into another. Cool water is sufficient.

Moisturise while the skin is still damp

After bathing or applying compresses, pat the skin dry gently — never rub — and immediately apply a moisturiser. The AAD specifically recommends products containing aloe vera or soy, which have soothing and anti-inflammatory properties. Applying moisturiser to damp skin helps lock in hydration, which is critical because sunburn dramatically increases transepidermal water loss (TEWL) through the damaged skin barrier.

Drink extra water

Sunburn causes a dual dehydration effect. Internally, your body redirects fluid to the damaged area as part of the inflammatory response. Externally, the compromised skin barrier loses moisture faster than healthy skin. Start drinking extra water immediately — do not wait until the next day. For more severe burns, electrolyte drinks help replace sodium and potassium lost alongside the fluid. Avoid alcohol, which acts as a mild diuretic and works against rehydration.

The Healing Timeline: What to Expect

Understanding the stages of sunburn recovery helps you give your skin what it needs at each phase.

Stage	Timeline	What happens
Redness and pain	Hours 4–48	Inflammation peaks; skin is hot, red, and tender
Swelling	Hours 12–72	Fluid accumulates in damaged tissue; resolves within 2–3 days
Blistering (moderate–severe)	Hours 6–48	Epidermis separates from dermis in severely damaged areas
Peeling	Days 3–7	Dead keratinocytes shed; the body discards irreparably damaged cells
New skin emerges	Days 5–10	Fresh, sensitive skin appears underneath — highly vulnerable to UV
Full resolution	Days 7–21	Mild burns resolve in a week; severe blistering burns can take 2–3 weeks

The face typically heals fastest (3–5 days) due to its rich blood supply. Shoulders and back take 5–7 days. The legs are often slowest — up to 14 days — because of reduced circulation.

What to Use — and What to Avoid

Not everything marketed as "aftersun" is actually helpful. Some common products can make things worse.

Use

Aloe vera gel — a meta-analysis of clinical trials found aloe vera shortened healing time for first- and second-degree burns by roughly 9 days compared to controls. Choose pure gel without added alcohol or fragrance
Moisturisers with hyaluronic acid, ceramides, or glycerin — these help rebuild the skin barrier and reduce TEWL
1% hydrocortisone cream — the NHS recommends this for a few days to reduce localised inflammation. Use sparingly and do not apply to blistered or broken skin
Broad-spectrum SPF 30+ sunscreen — essential once you return outdoors, as new skin is extremely UV-sensitive for 2–4 weeks after healing

Avoid

Ice or ice packs — risk of frostbite on damaged tissue
Petroleum jelly or oil-based ointments — these can trap heat in the skin and worsen the burn
Products containing benzocaine or lidocaine — topical anaesthetics ending in "-caine" can irritate sunburnt skin and have little evidence of effectiveness
Alcohol-based products — further dry out already dehydrated skin
Retinoids, AHAs, and other active exfoliants — hold off for at least 2–3 weeks after the burn fully resolves. These accelerate cell turnover and will irritate damaged skin
Peeling or picking at flaking skin — this interrupts the healing process and increases the risk of infection and scarring. Let it shed naturally

When Sunburn Needs Medical Attention

Most sunburns heal on their own with proper aftercare. But some require professional assessment:

Blisters covering a large area of the body — this indicates a second-degree burn
Fever above 39°C (103°F), chills, nausea, or vomiting — signs of sun poisoning, a severe systemic inflammatory reaction
Signs of infection — increasing pain after the first 48 hours, pus, red streaks, or worsening swelling
Dizziness, confusion, or feeling faint
Any severe sunburn on a child — children's skin is thinner and more vulnerable, and severe burns in childhood carry disproportionately high long-term risk

The American Academy of Dermatology reports that experiencing five or more blistering sunburns between ages 15 and 20 increases melanoma risk by 80% and non-melanoma skin cancer risk by 68%. Even a single severe burn warrants proper care.

Protecting New Skin After a Burn

Once peeling is complete and new skin is visible, recovery is not finished. The fresh epidermis has very little melanin and a skin barrier that is still rebuilding. For the next 2–4 weeks:

Apply broad-spectrum SPF 50 to any previously burnt areas before going outdoors
Wear protective clothing over healing skin where possible
Avoid deliberate tanning sessions until the skin is fully recovered
Continue daily moisturising to support barrier repair
Reintroduce any active skincare products (retinoids, vitamin C serums, AHAs) gradually and one at a time

The goal is simple: give your skin the time and conditions it needs to repair the DNA damage and rebuild its defences before exposing it to UV again.