Medically reviewed by Dr. Ponlawat Pitsuwan, Physician, Takecare Clinic Phuket. Last reviewed: September 2026.
Phuket’s sun is stronger than many visitors expect, and I regularly see severe sunburn after a single afternoon on a boat trip or a cloudy beach day. Blistered or feverish sunburn needs more than after-sun, and dehydration often comes with it.
Sunburn is one of the most predictable problems we see, and it often follows the first full day of a holiday. A speedboat trip to Phi Phi or the Similans, an afternoon asleep on a lounger at Kata after lunch and a couple of beers, or a cloudy day that felt safe are the usual stories. The skin looks pink by evening, and the real pain arrives the next night. Most burns settle with good home care, but blistering and whole-body symptoms need a proper assessment.
Why Phuket sun burns faster than you expect
Phuket sits about 8 degrees north of the equator, so the UV index regularly reaches 11 or higher, the “extreme” band, around the middle of the day. Water and pale sand reflect extra UV onto the skin, and light cloud lets most of it through. Ultraviolet B damages the DNA in surface skin cells, which triggers inflammation: redness starts within 2-6 hours and peaks at around 12-24 hours. Some medicines make skin far more sensitive to light, notably doxycycline (often taken for malaria prevention or acne), some water tablets such as hydrochlorothiazide, and acne treatments such as isotretinoin. Lime juice spilled on skin before sun exposure can cause blistering streaks called phytophotodermatitis, a reaction we see after beach-bar cocktails and Thai seafood meals.
Grading how bad the burn is
We grade sunburn by what the skin shows and how the body is coping. As a rough guide, your palm, including fingers, covers about 1% of your body surface.
| Grade | Skin | Rest of the body | Best place to manage it |
|---|---|---|---|
| Mild | Pink or red, tender, no blisters | Well | Self-care |
| Moderate | Bright red, hot, swollen, painful to touch | Thirst, mild headache | Self-care, or clinic if widespread |
| Blistering | Fluid-filled blisters, weeping skin | Pain disturbs sleep | Clinic if large, on face, hands, feet or genitals, or in a child |
| Sun poisoning | Widespread burn, often blistered | Fever, chills, nausea, vomiting, dizziness | Same-day doctor |
| Possible heatstroke | Hot skin | Confusion, fainting, temperature of 40°C or more | Call 1669 |
What “sun poisoning” really means
Nothing toxic is involved. Sun poisoning is the everyday name for severe sunburn that makes you ill as a whole: the inflamed skin releases chemical messengers that cause fever and shivering, and fluid loss through damaged skin and sweat adds headache, nausea and light-headedness. It often overlaps with heat exhaustion. The same phrase is sometimes used for polymorphic light eruption, an itchy rash of small bumps that appears hours after sun exposure on skin not used to it, which is an immune reaction rather than a burn.
When blistering needs a doctor
Blisters mean the burn has reached deeper into the skin, a superficial partial-thickness burn. Small blisters on the shoulders usually heal on their own in 7-10 days. We would like to see you if blisters cover more than a few palm-sized areas, sit on the face, around the eyes, on the hands, feet, genitals or over joints, appear on a baby or young child, or turn cloudy, yellow or surrounded by spreading redness, which suggests infection. Leave blisters intact, because the roof protects the raw skin underneath. If one bursts, rinse it with clean water and cover it with a non-stick dressing.
How we treat sunburn at the clinic
We check temperature, pulse and hydration, estimate how much skin is burnt and ask about light-sensitising medicines. Ibuprofen taken early eases pain and swelling if it is safe for you, with paracetamol as an alternative. Significant blisters get non-adherent dressings, and infected ones an antibiotic cream or tablets. A short course of mild steroid cream is sometimes used early, although its benefit is modest. Oral rehydration salts correct fluid loss, and if vomiting stops you drinking, intravenous fluids help; our IV drip therapy in Phuket page is honest that drips rehydrate but do not heal burnt skin any faster. Gritty, painful, watering eyes hours after a day on the water can be photokeratitis, a sunburn of the eye surface, which we also examine and treat.
Safe self-care while the skin recovers
Take cool showers or apply damp cloths for 15-20 minutes at a time; avoid ice directly on the skin. Aloe vera gel or a plain, fragrance-free moisturiser soothes and reduces dryness. Skip numbing sprays containing benzocaine, which can cause an allergic rash, and thick oily products on a fresh burn, which hold in heat. Drink more water than usual, go easy on alcohol, wear loose cotton and keep the burnt skin out of the sun until it has healed. Peeling usually starts after 4-7 days; let it happen without picking.
When to see a doctor
Most people with sunburn never need a doctor. Get checked if pain stops you sleeping despite painkillers, if blistering is extensive, if you feel feverish or sick, or if a baby under one year has any sunburn. Increasing redness, heat and pus a few days later suggest infection.
Prevention and early detection
Use a broad-spectrum sunscreen of SPF 30 or higher, and use enough: about 6-8 teaspoons, roughly 35 ml, covers an adult body. Apply 15-30 minutes before going out and reapply every 2 hours and after swimming or towelling. Seek shade from about 11:00 to 15:00, and wear a rash vest, a wide hat and UV-blocking sunglasses on boats. Thailand’s marine national parks, including those around the Similan and Phi Phi islands, ban sunscreens containing oxybenzone, octinoxate, 4-methylbenzylidene camphor or butylparaben, so check labels before a park trip.
Getting sunburn looked at by our team
Our Kata-Karon clinic, Patong clinic and Bangtao (Cherngtalay) clinic are all open 24 hours, so you can come in when the pain peaks at night. A walk-in doctor in Phuket visit needs no booking and usually takes under 30 minutes. If moving is painful, a doctor hotel visit in Phuket brings dressings and medicines to your room. Message us on WhatsApp or call +66 81 718 9080; we confirm the price on WhatsApp before your visit, bill most travel insurers directly and provide receipts, a medical report and an itemised invoice.
Related services and treatments
Beach days bring other skin problems too. Burning welts after a swim may need jellyfish sting treatment, itchy evening bumps often call for insect bite treatment, and a burst blister that turns red and hot may need skin infection treatment. A persistent night-time itch between the fingers points to scabies treatment, and a painful one-sided band of blisters to shingles treatment. See all conditions we treat.
Summary
Phuket’s UV is strong enough to burn fair skin in well under half an hour at midday. Mild burns heal with cooling, moisturiser, painkillers and fluids. Large or awkwardly placed blisters, burns in children and fever or vomiting need a doctor, while confusion or collapse means 1669. Plan shade, sunscreen and cover before the first beach day rather than after it.
“Reapply sunscreen every two hours and after swimming, and seek shade between 11am and 3pm. Clouds do not block the burn.”
Dr. Ponlawat Pitsuwan, Physician, Takecare Clinic Phuket
Frequently asked questions
Will my travel insurance cover a doctor visit for sunburn?
Policies differ. Many cover medical treatment for severe sunburn, but some treat it as avoidable and exclude it, so check your wording or call your insurer. We bill most travel insurers directly, and we provide receipts, a medical report and an itemised invoice if you need to claim yourself.
Do I need to book, and how long does a sunburn visit take?
No booking is needed at any of our three clinics, day or night. Walk-in patients are usually seen within minutes, and most sunburn visits take under 30 minutes, including dressings and medicines from our on-site pharmacy. You can send photos on WhatsApp first if you are unsure whether you need to come in.
Can a doctor treat my sunburn at my hotel?
Yes. A doctor can come to your hotel or villa anywhere in Phuket at any hour, which helps when clothes and car seats are painful. We assess the burn and hydration, dress blisters and leave the medicines you need. If you are confused or fainting, call 1669 instead of waiting for a visit.
Should I pop sunburn blisters to help them heal?
No. The blister roof acts as a natural dressing and lowers the risk of infection. Leave it alone and keep it clean. If a blister bursts by itself, rinse gently with clean water, leave the loose skin in place and cover it with a non-stick dressing. Cloudy fluid or spreading redness needs a doctor.
How can I tell sun poisoning from heatstroke?
Sun poisoning is severe sunburn with fever, chills, nausea and headache, but you stay alert and can talk normally. Heatstroke affects the brain: confusion, slurred speech, fainting or a seizure, often with very hot skin. Sun poisoning needs a same-day doctor, while suspected heatstroke needs 1669 and rapid cooling.
Can I swim or take a boat trip while my sunburn heals?
Wait until blisters have closed, because seawater and pool water can infect open skin. With unblistered sunburn, a short swim is fine if you cover the burnt areas with a rash vest and stay in the shade. Boat trips mean hours of reflected UV, so postpone them until the redness has faded.
Sources
The NHS gives practical advice on treating and preventing sunburn and on recognising heat exhaustion and heatstroke. MedlinePlus summarises the evidence on sun exposure and UV rays.
Sunburn, sun poisoning, superficial partial-thickness burn, polymorphic light eruption, phytophotodermatitis, photokeratitis, heatstroke, UV index, ibuprofen, aloe vera, oral rehydration salts, doxycycline, melanoma, ABCDE rule, NHS, MedlinePlus, Takecare Clinic Phuket, Kata, Patong, Bangtao, Similan Islands, Phi Phi, Dr. Ponlawat Pitsuwan
This page is general health information and not a substitute for a medical consultation.