Treating Sunburn on Koh Tao, Koh Phangan and Koh Samui

Why does sunburn go further here ?

Because several factors stack in the same direction. These islands sit close to the equator, where the sun is more directly overhead and the UV index is high for most of the day rather than peaking briefly. Sea and pale sand reflect light upward onto skin that sunscreen rarely reaches — under the chin, behind the knees, the underside of the arms.

Water compounds it twice over. It feels cooling, so the usual warning signal of overheating is absent, and it washes sunscreen off while people assume a single morning application has lasted the day. Add a sea breeze that masks the heat entirely, and most severe sunburn here happens to people who genuinely did not notice it occurring.

The delay makes it worse. Sunburn does not peak for several hours, so the point at which you realise is long after the damage was done. Someone who looks mildly pink at four in the afternoon can be scarlet by nine.

When is it more than skin deep ?

Fever and chills after a day in the sun are the combination people most often misread as a bug. Extensive sunburn causes a systemic response, and it frequently arrives alongside heat exhaustion and dehydration from the same afternoon.

How should you treat it ?

1. Get out of the sun completely, for days rather than hours.
2. Cool the skin with a cool shower or cool damp cloths, repeatedly rather than once.
3. Rehydrate properly, using oral rehydration solution rather than water alone.
4. Moisturise with a plain unperfumed lotion or aloe once the skin has cooled.
5. Take paracetamol for pain, and avoid ibuprofen if dengue is a possibility.
6. Cover up completely when you do go outside, with fabric rather than more sunscreen.

Burned skin loses fluid, which is why rehydration belongs on that list rather than being an afterthought. Someone with extensive sunburn is dehydrating through damaged skin at the same time as they are losing fluid to the heat.

What makes it worse ?

• Bursting blisters. They are a sterile dressing. Opening them invites infection.
• Ice directly on skin. Cool, not cold; ice on burned skin causes further injury.
• Butter, oil, coconut oil or toothpaste. No benefit, and they trap heat.
• Perfumed lotions and after-sun with alcohol. Stinging and irritating.
• Anaesthetic sprays. Frequently cause reactions on damaged skin.
• More sun, under cloud or in water. UV passes through both.
• Hot showers. They feel good and prolong the inflammation.

Why does it matter beyond the week ?

Two reasons worth stating plainly. Sunburn damages the skin barrier, which makes every other skin problem on these islands more likely — fungal rashes, folliculitis and infected bites all take hold more easily on skin that has been burned and is peeling.

The longer-term reason is that sunburn, particularly blistering sunburn, carries a lasting risk. A few bad burns do more than a tanned summer, and the damage accumulates. That is not a lecture about this trip; it is the reason to treat a blistering burn as an injury rather than an inevitable part of a beach holiday.

Our clinics can dress blistered areas, treat the pain and inflammation, and give IV fluids where someone is dehydrated. A burn that needs more than that is referred on, and the clinic arranges the transfer. Any procedure fee is quoted before it is done.

Children and medication change the thresholds

Children burn faster and have a larger surface area relative to their size, which means a burn that would be uncomfortable on an adult can make a child genuinely unwell. Keep young children shaded and covered rather than relying on sunscreen alone, and have any significant burn on a child looked at rather than managed at home.

Several common medications also increase sun sensitivity, including some antibiotics, acne treatments and anti-inflammatories. If you have started something new and burn far faster than you expect, that is worth mentioning rather than putting down to a stronger sun. Ask at the clinic, and in the meantime cover up — see our note on replacing and managing medication while travelling.

How do you avoid it here specifically ?

The generic advice applies, with three local additions that matter more than they would at home.

• Reapply after every swim, not every few hours. Water removes it regardless of claims.
• Use a wet rash vest rather than relying on sunscreen for snorkelling and diving, since your back is horizontal and exposed for an hour at a time.
• Remember the reflected light — under the chin, behind the ears, the tops of the feet.
• Stay out of the sun between roughly eleven and three, when the UV is at its worst.
• Treat cloud and breeze with suspicion, since both remove the warning without removing the UV.
• Use more than you think. Most people apply a fraction of the amount products are tested at.

Divers and snorkellers are the group most likely to be caught out, because they are face-down and stationary for long periods with the back of the neck, the backs of the legs and the tops of the ears fully exposed. The NHS guidance on sunburn is a sound reference for treatment.

The peeling stage

Peeling begins a few days in and is the point at which people assume the episode is over. The new skin underneath is thin, easily damaged and considerably more sun-sensitive than what it replaced, which is why a second burn over a peeling area is both easier to get and worse when it happens.

Do not pick or pull at peeling skin, since tearing it removes the covering before the layer beneath is ready. Moisturise, stay covered for several more days than feels necessary, and treat the peeling area as still healing rather than as a finished problem.

Should you be seen ?

• Confusion, drowsiness or collapse → emergency, call now
• Fever, chills, nausea or headache with sunburn → same day
• Extensive blistering → same day
• Burn on the face, hands or around the eyes → same day
• Signs of infection after a day or two → same day
• Red, sore, no blisters, feeling otherwise well → treat it at home, stay out of the sun