Sunburn Treatment in Phuket: Blister Care, Pain Relief and Sun Poisoning
Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician, Takecare Clinic Phuket. Last reviewed: September 2026.
“The worst sunburns we treat usually follow the same day: a long-tail boat trip to the islands, snorkelling face down for hours, a breeze that makes it feel cool, and sunscreen applied once in the morning. The burn shows up that evening, and by the next morning the back of the legs and shoulders are blistered and the person has a fever and a headache. By then it is not only a skin problem; it is often dehydration and heat stress as well.” Dr. Ponlawat Pitsuwan
What sunburn is, and why it happens so fast in Phuket
Sunburn is an inflammatory reaction in the skin caused by ultraviolet (UV) radiation, mainly UVB. UV damages the DNA in skin cells; the body responds by widening blood vessels and releasing inflammatory chemicals, which causes the redness, heat, pain and swelling that appear two to six hours after exposure and peak at around 24 hours. Repeated sunburn also raises the long-term risk of skin cancer, including melanoma.
Phuket sits about eight degrees north of the equator, so the tropical sun is high overhead for much of the year. The UV index, a scale that measures the strength of the sun’s burning rays, is frequently in the “extreme” band of 11 or higher around the middle of the day, even when it is hazy or cloudy. At that level, fair skin can start to burn in well under 15 minutes. Sand and water reflect UV back on to the skin, and sea water washes sunscreen off, so time at the beach or on a boat adds up quickly.
Some medicines make skin much more sensitive to sunlight (photosensitivity). The one we see most in travellers is doxycycline, often taken as malaria prevention or for acne. Others include some diuretics, certain anti-inflammatories and isotretinoin. If you take any of these, you may burn far faster than you expect.
Sunburn symptoms: from mild burn to sun poisoning
A mild (superficial) sunburn makes the skin red, hot, tender and sometimes a little swollen, and it peels after several days. A more severe burn, which doctors call a superficial partial-thickness burn, forms blisters, is very painful and takes one to two weeks to heal. Blisters over a large area mean the skin barrier is broken, which allows fluid loss and raises the risk of infection.
“Sun poisoning” is not a medical term but is widely used for severe sunburn with whole-body symptoms: fever, chills, headache, nausea, vomiting, dizziness and feeling faint. These symptoms come from widespread skin inflammation combined with dehydration. The same phrase is sometimes used for polymorphic light eruption, an itchy bumpy rash that appears on sun-exposed skin in the first days of a sunny holiday and is not a burn at all.
Heat exhaustion or heatstroke?
Many people with bad sunburn in Phuket are also suffering from heat illness. Heat exhaustion happens when the body loses too much water and salt through sweat; it is uncomfortable but recovers with cooling and fluids. Heatstroke is a medical emergency in which the body’s temperature control fails, and it can damage the brain and other organs.
| Feature | Heat exhaustion | Heatstroke |
|---|---|---|
| Body temperature | Normal or raised, below about 40°C | 40°C or higher |
| Skin | Pale, cool, clammy, heavy sweating | Hot and flushed; sweating may have stopped |
| Mental state | Alert, tired, headache, dizziness | Confused, agitated, slurred speech, seizures or unconscious |
| Other signs | Nausea, cramps, thirst, dark urine | Fast breathing, racing heart, vomiting, collapse |
| What to do | Move to shade or air conditioning, lie down, sip water or oral rehydration salts; should improve within 30 minutes | Call 1669 immediately; cool with water and fanning while waiting |
How we treat sunburn at Takecare
The doctor first assesses how much of your body is burned, how deep the burn is, whether blisters are intact or broken, and whether you have fever, vomiting or signs of dehydration such as a fast pulse, low blood pressure or very little urine. We ask about medicines that cause photosensitivity and check for heat illness.
For pain and inflammation we usually recommend an anti-inflammatory such as ibuprofen, if it is safe for you, taken early and regularly for the first two days, or paracetamol. Cool compresses, cool (not ice-cold) showers and a fragrance-free moisturiser or aloe vera gel soothe the skin; keeping the gel in the fridge makes it more soothing. We advise against butter, oils, toothpaste and “-caine” numbing sprays such as benzocaine, which can irritate burned skin or cause an allergic rash. A short course of a mild steroid cream is sometimes used for very inflamed, non-blistered areas.
Blisters are best left intact because the roof is a natural sterile dressing. Large, tense blisters or blisters over joints, feet or hands may be drained under clean conditions, leaving the roof in place, and covered with a non-stick dressing. Broken blisters are cleaned and dressed, and we check them for infection at follow-up. If you are dehydrated and cannot keep fluids down, we can give intravenous fluids. Honestly, the evidence for IV fluids is for correcting dehydration; it does not heal the burn itself, and most people do well with oral rehydration salts.
When to see a doctor
See a doctor the same day if blisters cover a large area (for example most of the back or both legs), if blisters are on the face, hands, feet or genitals, or if you have fever, chills, headache, nausea, vomiting or dizziness. Children need a lower threshold: any blistering sunburn in a child, or any sunburn in a baby under 12 months, should be checked. Come back if a blister becomes cloudy, the surrounding skin turns increasingly red, hot and swollen, or you see pus or red streaks, which suggest infection.
Go to a hospital emergency department or call 1669 if someone has signs of heatstroke: a temperature of 40°C or higher, confusion, fainting, seizures or collapse. Start cooling them straight away with cool water, wet towels and a fan while you wait.
Prevention and early detection
Check the UV index in a weather app each morning and plan shade between about 10 a.m. and 3 p.m., when UV is strongest. Use a broad-spectrum sunscreen of SPF 30 or higher, applied generously 15 to 30 minutes before going out: most adults need about six to eight teaspoons to cover the whole body. Reapply every two hours and immediately after swimming or towelling, even if the label says water resistant. Rash vests, wide-brimmed hats and UV-blocking sunglasses protect far better than sunscreen alone, especially while snorkelling, when the backs of the legs and neck are exposed for long periods.
For children, use protective swimwear and hats, keep babies under six months out of direct sun altogether, and make them take breaks in the shade and drink regularly. Early detection means noticing pink skin early: sunburn keeps developing for hours after you leave the sun, so cover up and cool down at the first sign of redness. In the longer term, any new or changing mole deserves a doctor’s check once you are home.
Visiting Takecare Clinic in Phuket
All three Takecare clinics are open 24 hours a day, 7 days a week, and you can walk in without an appointment. Choose Takecare Clinic Bangtao (Cherngtalay) if you are staying around Bangtao, Laguna or Surin, Takecare Clinic Kata-Karon on Kedkwan Road for the southern beaches, or Takecare Clinic Patong on Prachanukroh Road. Most visits take under 30 minutes, and dressings and medicines are supplied by our on-site pharmacy.
Blistered skin and a car seat are a bad combination, so many sunburn patients prefer a doctor at their hotel or villa, available anywhere in Phuket at any hour. WhatsApp us a photo of the burn or call 081-718-9080 and we will advise on the best option.
We confirm the price on WhatsApp before your visit, offer direct billing with most travel insurers, and provide a medical report and itemised receipt for claims.
Related services and treatments
If you are badly dehydrated after a burn or heat exhaustion, our page on IV drip therapy in Phuket explains when intravenous fluids genuinely help and when drinking is enough. Blisters that turn cloudy and red may need treatment for an infected burn or skin infection. A day on the water can also bring a sting, so it helps to know the right jellyfish sting treatment before you go, and itchy spots on the ankles after an evening on the beach are often sandfly bites covered in our insect bite treatment guide.
Occasionally a painful rash that starts after a sunburn is something else: a burning band of blisters on one side of the body points to shingles, described on our shingles treatment page, and an intensely itchy rash that is worse at night may be scabies needing treatment. For any other health question, a walk-in doctor in Phuket is on duty around the clock.
Summary
Sunburn in Phuket happens quickly because the UV index is often extreme, and water, sand and a cooling breeze hide how much sun you are getting. Mild burns heal with cooling, moisturiser, fluids and anti-inflammatory pain relief. Widespread blisters, fever, vomiting, dizziness or a burned child need a doctor, and confusion or a temperature of 40°C or more after sun exposure is heatstroke, which needs 1669. Takecare Clinic Phuket assesses and treats sunburn around the clock in Bangtao, Kata and Patong, or in your hotel room.
“If you are going snorkelling, wear a rash vest and board shorts rather than relying on sunscreen. The backs of the knees and thighs are where we see the deepest burns, because nobody feels the sun on them while their face is in the water.” Dr. Ponlawat Pitsuwan
Frequently asked questions
When is sunburn serious enough to see a doctor?
See a doctor if blisters cover a large area or are on the face, hands, feet or genitals, if you have fever, chills, vomiting, headache or dizziness, or if you cannot drink enough to stay hydrated. Any blistering burn in a child, and any sunburn in a baby under 12 months, should be checked. Confusion or a very high temperature after sun exposure suggests heatstroke and needs 1669.
Should I pop my sunburn blisters?
No. The blister roof protects the raw skin underneath from infection, so leave it intact and let it flatten on its own. Cover blisters that rub on clothing with a non-stick dressing. Large, tense or awkwardly placed blisters can be drained safely by a doctor while keeping the roof in place. If a blister breaks, wash it gently, cover it, and watch for spreading redness or pus.
How long does bad sunburn take to heal?
Mild redness usually settles in three to five days, followed by peeling. A blistering burn typically takes one to two weeks to heal, and the new skin stays sensitive and burns easily for several more weeks. Fever and nausea from sun poisoning usually improve within one to two days with rehydration and rest. Burns that are not healing after two weeks should be reviewed.
Can I get sunburn treatment without an appointment?
Yes. Takecare Clinic Phuket accepts walk-ins 24 hours a day at our Bangtao, Kata and Patong branches, and you are usually seen by an English-speaking doctor within minutes. You can send us a photo on WhatsApp first if you are unsure whether you need to come in, and we will tell you honestly whether home care is enough.
Can a doctor treat sunburn at my hotel?
Yes. Our doctors visit hotels and villas anywhere in Phuket, day or night, which many patients prefer when blistered skin makes sitting in a car painful. The doctor can assess the burn, drain and dress large blisters, give pain relief and, if you are dehydrated and vomiting, start fluids in your room.
Does travel insurance cover sunburn treatment?
Coverage for sunburn varies between policies, and some treat it differently from accidental injuries, so check your policy wording. We offer direct billing with most travel insurers and provide a medical report and itemised receipt if you need to claim yourself. Message us your insurer’s name on WhatsApp and we will confirm what we can arrange before your visit.
Sources
NHS: Sunburn. NHS: Heat exhaustion and heatstroke. CDC: Reducing risk for skin cancer.
Sunburn, sun poisoning, solar erythema, superficial partial-thickness burn, blisters, polymorphic light eruption, ultraviolet radiation, UVB, UV index, photosensitivity, doxycycline, heat exhaustion, heatstroke, dehydration, oral rehydration salts, intravenous fluids, ibuprofen, paracetamol, aloe vera, hydrocortisone, broad-spectrum sunscreen, SPF 30, melanoma, NHS, CDC, 1669, Bangtao, Cherngtalay, Kata, Karon, Patong, Phuket, Dr. Ponlawat Pitsuwan, Takecare Clinic Phuket.
This page is general health information and not a substitute for a medical consultation.