Sunburn: Cooling, Blisters and Care

Reviewed June 24, 2026 by Sara, licensed pharmacist. This article is general education, not personal medical advice.

It is easy to treat sunburn as a holiday inconvenience or a tan that went slightly wrong. In reality, red, hot, painful skin is skin that has been damaged by ultraviolet radiation. It needs a little patience, gentle care, and protection from more sun while it recovers.

The first move is the simplest one: once the skin is pink, sore, or tight, get out of the sun. Trying to continue the day outdoors because the redness does not look dramatic yet is how a mild burn becomes a much more painful one later.

First steps when you notice a burn

Move into shade or indoors as soon as possible. Cool the skin gently with a cool shower or a damp cloth. Avoid ice directly on the skin, which can cause further irritation, and avoid vigorous rubbing or exfoliating products.

After cooling, use a plain fragrance-free moisturiser or after-sun product that feels comfortable on the skin. The goal is to support the skin barrier, not to layer on every active ingredient in the cupboard. Products containing alcohol, perfume, strong acids, retinoids, or exfoliating scrubs can sting and make irritated skin feel worse.

Sunburn severity guide

What you see or feel	What it suggests	What I would do
Pink, warm, tender skin	Mild sunburn	Cool gently, moisturise, hydrate and avoid more sun.
Painful red skin over a larger area	More significant burn	Rest, fluids, suitable pain relief if safe, and close monitoring.
Blisters	Deeper skin damage	Do not pop them; ask for advice if large, widespread or very painful.
Fever, chills, dizziness or confusion	Heat illness or severe reaction may be involved	Seek medical advice urgently.
Worsening redness, warmth, pus or swelling	Possible infection	Get assessed.

The first evening matters

Sunburn often feels worse several hours after the exposure, which is why people underestimate it while they are still outside. The first evening is the time to be boring and gentle: cool the skin, drink water, avoid alcohol if you are dehydrated, wear loose clothing, and stop all exfoliating or irritating skincare on the burned area.

If you use acne treatments, retinoids, acids, or medicines that can make skin more sensitive to the sun, be extra careful. I talk more about routine choices in the acne article, but on burned skin the priority is not “active” skincare. It is comfort, barrier support, and avoiding further irritation.

Fluids, clothing, and pain relief

Sun exposure, heat, and sweating can all contribute to dehydration, so drink regularly. Choose loose, soft clothing and avoid further sun exposure on the burned area while it heals.

Pain relief such as paracetamol or ibuprofen can be appropriate for some people, but the right choice depends on medical history and other medicines. Follow the leaflet and ask a pharmacist or clinician when you are unsure, especially during pregnancy or with stomach, kidney, heart, or blood-thinning medicines.

Also check whether any current medicines can increase sun sensitivity. Some antibiotics, acne treatments, anti-inflammatory medicines, herbal products, or topical actives may make skin react more easily in the sun. A pharmacist can check the exact medicine and explain what extra precautions make sense.

Supplements and herbal products should be mentioned too, because “natural” does not automatically mean irrelevant. If you take regular products, keep a list and show it when asking for advice, just as you would with medicines. The same principle applies in my supplements guide: safety checks depend on the exact product and dose, not the general category.

Blisters and peeling

Blisters are a sign that the burn is more significant. Do not pop them: the skin over a blister helps protect the tissue underneath. Keep the area clean, avoid friction, and seek advice if the blisters are large, widespread, or especially painful.

Peeling can happen as the skin heals. It is tempting to pick at it, but be gentle. Moisturise, let the skin shed naturally, and protect it from the sun. A fresh burn is particularly vulnerable to more damage.

When to seek medical help

Seek medical advice if sunburn is extensive, very painful, blistering, or accompanied by fever, chills, nausea, dizziness, confusion, fainting, dehydration, or symptoms that are worsening. Get advice sooner for babies and young children, older adults, people with a weakened immune system, and anyone taking medicines that increase sun sensitivity.

If a blistered area develops increasing redness, swelling, warmth, pus, or worsening pain, it also needs assessment because infection is possible.

In Italy, a pharmacist can help choose simple after-sun care, check pain-relief suitability and review medicines that may increase sun sensitivity. A medico di base or continuita assistenziale is more appropriate if the burn is large, blistering or worsening. Call 112 if there is fainting, confusion, severe dehydration, severe weakness or a person who seems seriously unwell after heat and sun exposure.

Prevention is more than sunscreen

Use broad-spectrum sunscreen with a high SPF, apply it generously, and reapply it according to the label, particularly after swimming, sweating, or towel drying. But sunscreen is one part of protection, not permission to stay in intense sun all day.

Shade, a hat, sunglasses, protective clothing, and planning around the strongest sun are often the things people forget. The most reliable approach combines all of them.

After a significant burn, protect the area carefully for several weeks. Newly healed skin can mark more easily and burn again faster, so covering it is usually better than trusting sunscreen alone.

I would also separate sunscreen use from tanning goals. Sunscreen reduces risk; it does not make long intense exposure harmless. If the skin is already pink, tight, hot, or sore, the plan has already failed for that day. Stop, cover up, and protect the area instead of trying to “finish” the beach or city walk.

For children, older adults, and people taking medicines that increase sun sensitivity, I would be even more cautious. A burn is not only uncomfortable; it is a sign that the skin has been injured. Prevention is much easier than trying to repair a bad burn afterwards.

Frequently asked questions

What is the first thing to do for sunburn?

Get out of the sun, cool the skin gently, drink fluids and protect the area from more exposure. Do not put ice directly on the skin.

Should I pop sunburn blisters?

No. Blisters protect the damaged skin underneath, so popping them can increase irritation and infection risk.

When does sunburn need medical advice?

Seek advice for extensive, very painful or blistering sunburn, or if there is fever, chills, nausea, dizziness, confusion, fainting, dehydration or worsening symptoms.

Can medicines make sunburn more likely?

Some antibiotics, acne treatments, anti-inflammatory medicines, herbal products and topical actives can increase sun sensitivity. Ask a pharmacist with the exact product name.