A blistering sunburn is more than a painful holiday mishap. Blisters mean the sun has caused a second-degree burn, damaging deeper layers of skin. Knowing how to treat sunburn blisters promptly can reduce discomfort and the chance of infection, but some burns need medical assessment the same day.
Australia’s UV levels can cause serious skin damage quickly, including on cool, cloudy or windy days. Get out of the sun immediately, protect the affected area, and take the burn seriously. Every episode of severe sunburn adds to cumulative UV damage, a key risk factor for skin cancer later in life.
First steps to treat sunburn blisters
Move indoors or into deep shade as soon as you notice significant redness, pain or blistering. Cool the burned skin under a gentle, cool running shower or use a clean damp cloth for 20 minutes. Do not use ice, iced water or frozen packs directly on the skin. Extreme cold can worsen tissue damage and make pain harder to manage.
Drink water regularly. A large sunburn can draw fluid towards the skin and contribute to dehydration, particularly after a hot day outdoors, physical work or exercise. Avoid alcohol while recovering, as it can further dehydrate you.
Remove tight clothing, jewellery or shoes near the burn before swelling increases. Choose loose, soft cotton clothing that will not rub or stick to the affected area. Stay out of direct sunlight until the skin has healed. Covering up with loose clothing and seeking shade are safer than relying on sunscreen over damaged, blistered skin.
For pain, paracetamol or ibuprofen may help when used according to the packet directions. Ibuprofen is not suitable for everyone, including some people with stomach ulcers, kidney disease, certain heart conditions, or those taking particular medicines. Speak with a pharmacist or clinician if you are unsure which option is safe for you.
Should you pop a sunburn blister?
No. Leave sunburn blisters intact whenever possible. The clear fluid and unbroken surface create a natural barrier against bacteria while new skin forms underneath. Popping, cutting or peeling blisters increases the risk of infection and can delay healing.
A small intact blister can usually be left alone and protected from friction with a sterile, non-stick dressing. Change the dressing if it becomes wet, dirty or loose. Avoid adhesive dressings directly over fragile blistered skin, as removing them can tear the area further.
Sometimes a large blister breaks on its own. Wash your hands first, then gently rinse the area with clean water. Do not pull away the loose skin unless a health professional advises you to do so. Cover it with a sterile non-stick dressing and arrange medical advice if the wound is extensive, painful, or difficult to keep clean.
Avoid home remedies that can irritate a burn or trap heat, including butter, oils, toothpaste and strongly fragranced products. Do not apply topical anaesthetic creams unless a pharmacist or doctor recommends them. Some products can cause contact dermatitis on already damaged skin.
When blistering sunburn needs urgent medical care
A blistering burn may be manageable at home if it is small, localised and you otherwise feel well. However, the location, size and symptoms matter. Seek same-day medical advice from a GP, urgent care service or hospital if the burn covers a large area or affects a sensitive part of the body.
Get urgent medical help if you notice any of the following:
- Blisters over a large area, or burns affecting the face, eyes, hands, feet, genitals, buttocks or a major joint
- Severe pain that is not controlled with usual pain relief
- Fever, chills, nausea, vomiting, dizziness, headache, weakness or confusion
- Signs of dehydration, such as very dark urine, minimal urination, dry mouth or fainting
- Increasing redness, warmth, swelling, pus, a bad smell, red streaks or worsening pain around a blister
- Burns in a baby or young child, or in someone who is older, immunocompromised, or has a condition that affects healing
Call 000 if someone is confused, faints, has trouble breathing, has a seizure, or appears severely unwell. Heat exhaustion and heatstroke can occur alongside sunburn and require prompt action.
Watch for infection in the days after the burn
Sunburn blisters can become infected after they burst or are rubbed open. Infection does not always begin immediately. It may develop over the next few days as the skin attempts to heal.
Redness from a burn should gradually settle, not spread. If redness expands beyond the original burn, the skin becomes increasingly hot or tender, or you develop pus, fever or flu-like symptoms, arrange urgent medical assessment. Do not try to treat a suspected infection with leftover antibiotics or creams from a previous condition.
What healing should look like
Pain and heat generally improve over several days, while blistered skin may take one to two weeks to heal. Keep the area clean, protected and out of the sun. Once the skin is no longer open or weeping, a plain, fragrance-free moisturiser may ease dryness and tightness.
Do not peel flaking skin. It is tempting, especially when the burn begins to itch, but pulling skin away can expose tender tissue underneath. Pat the area dry after bathing and avoid scrubs, exfoliants and hot showers until it has recovered.
Do not return to outdoor work, sport, beach days or gardening with the burned area exposed. Australian UV radiation remains strong well beyond summer, and freshly healed skin burns more easily. Plan protection before you step outside: shade, broad-brimmed hats, wraparound sunglasses, protective clothing and broad-spectrum SPF 50+ sunscreen on intact skin.
A blistering burn is a warning about UV exposure
Sunburn does not need to blister to cause lasting harm. UV radiation damages skin cells, and repeated exposure contributes to melanoma and other skin cancers. This risk applies across skin tones. While people with fair skin may burn more visibly, people with darker skin can still sustain UV damage and develop skin cancer, often with later diagnosis.
A severe burn is a useful point to review your sun-protection habits without blame. Outdoor workers may need shade breaks and protective workwear. Parents may need to rethink how long children spend in direct sun. Runners, surfers, golfers, fishers and gardeners may need protection that suits their activity rather than sunscreen alone.
It is also worth paying attention to spots that do not behave like a healing burn. A sunburn should steadily improve. A new or changing mole, a sore that does not heal, a scaly patch that persists, or a spot that bleeds without clear reason should be assessed by a qualified health professional. A skin check is particularly worthwhile if you have had frequent sunburns, work outdoors, have many moles, or have a personal or family history of skin cancer.
Treat the immediate injury with care, then let it change what happens next time you head outdoors. Protecting your skin today is practical prevention, and timely skin checks can save lives.