Skin Rash Treatment in Phuket: What Your Rash Is and How We Treat It
Heat, humidity, sweat, strong sun, sea water and unfamiliar insects make skin rashes one of the most common reasons visitors see a doctor in Phuket. Many look alike at first glance: a red, itchy patch could be heat rash, a fungal infection, an allergy to a new sunscreen or a cluster of bites, and each needs a different treatment. The wrong cream can make a rash worse, so a quick examination is often the fastest route to relief.
Rashes we see most in Phuket: which rash is it?
This table is a starting point, not a diagnosis. Several rashes can look similar, and some people have more than one at the same time.
| Rash | What it looks like | Where | Itch or fever? | What usually helps |
|---|---|---|---|---|
| Heat rash (prickly heat) | Tiny red bumps or clear pinhead blisters | Neck, chest, back, skin folds, under straps | Prickly itch, no fever | Cooling down, loose clothing, calamine |
| Fungal rash (tinea, intertrigo) | Scaly ring with a clearer centre, or red moist rash in folds | Groin, feet, under breasts, waistband | Itchy, no fever | Antifungal cream for 2 to 4 weeks, keeping dry |
| Insect or bed-bug bites | Raised itchy bumps, often in lines or clusters | Exposed skin | Very itchy, no fever | Antihistamine, mild steroid cream, no scratching |
| Hives (urticaria) | Raised pale-pink welts that move within hours | Anywhere | Very itchy, usually no fever | Antihistamines; emergency care if the face or throat swells |
| Contact dermatitis | Red, sometimes blistered patch with a clear edge | Where a product or plant touched | Itchy or burning, no fever | Avoiding the trigger, short course of steroid cream |
| Sun rash | Small itchy bumps hours after strong sun | Chest, arms, backs of hands | Itchy, no fever | Shade, sunscreen, antihistamine |
| Dengue rash | Flushed red rash, sometimes with pale islands of normal skin | Body and limbs | Follows a high fever | Blood test and medical review |
| Scabies | Tiny bumps and thin burrows | Between fingers, wrists, waist, genitals | Intense itch, worst at night | Prescription treatment for the whole household |
| Shingles | Painful band of blisters | One side of the body | Burning pain before the rash | Antivirals, ideally within 72 hours |
Heat rash (prickly heat)
Heat rash, also called prickly heat or miliaria, happens when sweat ducts become blocked and sweat leaks into the skin. In Phuket’s year-round heat it is the most common rash in new arrivals, babies and anyone who has spent the day in tight or synthetic clothing. It looks like clusters of tiny red bumps or clear pinhead blisters, mostly on the neck, chest, back, armpits and groin, with a prickling or stinging itch. It is not an infection and is not contagious.
Heat rash usually settles within a few days once the skin is kept cool: air conditioning or a fan, cool showers, loose cotton clothing, and avoiding heavy creams and oils that block the pores further. Calamine lotion soothes the itch. See a doctor if the bumps become painful, fill with pus or are surrounded by spreading redness, which suggests infection, or if a baby with heat rash also has a fever.
Fungal rashes in the humidity
Fungi love warm, damp skin, so fungal rashes flourish in Phuket’s humidity, especially if you spend hours in wet swimwear or sweaty clothes. Tinea, often called ringworm, causes ring-shaped, scaly, itchy patches with a clearer centre on the body, in the groin (jock itch) or between the toes (athlete’s foot). Candida yeast causes a bright red, moist rash in skin folds with small satellite spots, and pityriasis versicolor produces pale or light-brown patches on the chest and back that stand out after a tan.
Fungal rashes need an antifungal cream such as clotrimazole, miconazole or terbinafine, usually for two to four weeks and for a week or two after the rash has gone, plus keeping the area dry. Steroid creams on their own can make a fungal rash spread. If a fungal rash becomes cracked, weeping, hot or painful, it may have become infected; our page on skin infection treatment explains how infected rashes and cellulitis are treated.
Bites: mosquitoes, bed bugs and sea lice
Mosquito and sandfly bites cause itchy, raised bumps on exposed skin, and some people react with large, swollen welts. Bed bug bites typically appear as itchy bumps in a line or cluster on skin that was uncovered during sleep, often noticed on waking. Sea lice, more accurately called seabather’s eruption, is an itchy rash of small red bumps under the area covered by a swimsuit, caused by tiny jellyfish and sea anemone larvae trapped against the skin.
Most bite reactions settle with a non-drowsy antihistamine, a cold compress and a short course of mild steroid cream, and by not scratching, because broken skin is how bites become infected in the tropics. Our page on insect bite treatment covers bites in more depth, and stings and welts from the sea are covered under jellyfish sting treatment. If sea lice are around, take off your swimsuit and shower soon after swimming.
Allergic rashes and hives
Hives, or urticaria, are raised, very itchy welts that can appear anywhere, change shape and move around over hours. They can be triggered by foods such as shellfish and nuts, medicines including antibiotics and anti-inflammatory painkillers, insect stings, viral infections, heat or pressure, and often no clear cause is found. Most hives settle within a day or two with a non-drowsy antihistamine.
Hives become an emergency when they come with swelling of the lips, tongue, face or throat, difficulty breathing or swallowing, wheeze, vomiting or feeling faint: these are signs of anaphylaxis, which needs adrenaline and a call to 1669. For hives that keep coming back, or a suspected food or drug allergy, see our page on allergy treatment in Phuket.
Contact dermatitis and eczema: sunscreen, plants and hotel products
Contact dermatitis is an itchy, red rash, sometimes with small blisters, that appears where the skin touched something it reacted to. On holiday, common triggers are new sunscreens and insect repellents, fragranced hotel soaps and laundry detergents, black henna tattoos, nickel in jewellery, and the sap of tropical plants and fruit such as mango. The rash often has a clear edge that matches the shape of the contact.
Treatment is to identify and avoid the trigger and use a short course of steroid cream to calm the inflammation. People with eczema (atopic dermatitis) often find it flares with heat, sweat and chlorinated pools; keep moisturising with a plain, fragrance-free emollient and rinse off after swimming. A rash that weeps, crusts or becomes painful may have become infected and should be checked.
Sun rash and sunburn
Polymorphic light eruption, often called sun rash or sun allergy, causes small itchy bumps or blisters on sun-exposed skin such as the chest, arms and backs of the hands, usually hours after the first strong sun of a holiday. It typically settles within a week if you stay out of the sun, and can be eased with an antihistamine and a mild steroid cream. Some medicines, including the antibiotic doxycycline, make the skin far more sensitive to sunlight and can cause an exaggerated burn or rash. Red, hot, painful skin after time outdoors is more likely sunburn, which is covered on our sunburn treatment page.
Rashes with fever: dengue, hand, foot and mouth disease and scarlet fever
A rash that comes with a fever needs a doctor’s assessment, particularly in Thailand. Dengue fever, spread by day-biting mosquitoes, causes a sudden high fever, headache, pain behind the eyes and aching muscles, and a rash often appears a few days later, sometimes as a flushed red rash with small pale islands of normal skin. Dengue needs a blood test and close monitoring; see dengue fever treatment in Phuket.
In children, hand, foot and mouth disease causes a mild fever, painful mouth ulcers and small blisters on the hands, feet and buttocks. It is common in Thailand and usually settles within a week, but children who stop drinking need to be seen. Scarlet fever, caused by strep bacteria, gives a sore throat, fever and a rough, sandpaper-like red rash, and is treated with antibiotics. Any rash with fever that does not fade when pressed with a glass needs urgent medical care.
Scabies and shingles
Scabies is caused by a tiny mite that burrows into the skin. It causes an intense itch that is worst at night, with small bumps and thin, wavy lines between the fingers, on the wrists, around the waist and on the genitals. It spreads by close skin contact and needs a prescription treatment for everyone in the household at the same time; read more about scabies treatment in Phuket.
Shingles is a reactivation of the chickenpox virus. It usually starts with burning or tingling pain on one side of the body, followed by a band of blisters a few days later. Antiviral tablets work best when started within 72 hours of the rash appearing, so see a doctor promptly; our shingles treatment page explains more.
When a rash needs a doctor today
See a doctor the same day if your rash is spreading quickly, is painful rather than itchy, has blisters or peeling skin, is hot and swollen, is weeping pus or crusting, or comes with a fever or feeling unwell. A rash near the eye, any rash in a baby under three months, and rashes in people with diabetes or a weakened immune system should also be seen promptly, as should any rash that is not improving after a week of simple care.
Call 1669 or go to a hospital emergency department if there is swelling of the lips, tongue or throat, difficulty breathing, widespread blistering or skin that is peeling away, sores in the mouth and eyes together with a fever (which can follow a reaction to a new medicine), or a rash that does not fade under a glass in someone who is unwell.
Pharmacy creams vs seeing a doctor
Thai pharmacies sell many skin creams over the counter, and for a simple rash they can help. Calamine lotion soothes heat rash and bites. Non-drowsy antihistamine tablets ease hives and itchy bites. Mild hydrocortisone cream calms bites, contact dermatitis and eczema when used thinly for a few days, but it should not be used on a rash that might be fungal or infected, on broken skin, or on the face for more than a few days. Antifungal creams treat tinea and candida but not eczema or allergy.
The common problem is the wrong cream for the rash. Combination creams that contain a strong steroid, often sold for any rash, can make a fungal infection spread and can thin the skin with longer use. If a rash has not improved after a few days of pharmacy treatment, has spread, or you are not sure what it is, a short examination usually settles the question and saves days of trial and error.
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: Takecare Clinic Bangtao (Cherngtalay), Takecare Clinic Kata-Karon and Takecare Clinic Patong. See a walk-in doctor in Phuket at any branch, or book a doctor hotel visit in Phuket if you would rather be seen in your room. For questions before you come, a telemedicine consultation or a message on WhatsApp is a good first step, or call 081-718-9080.
We confirm the price on WhatsApp before your visit. If a rash needs a specialist opinion, the doctor will advise you on referral.
Frequently asked questions
How do I know if it’s heat rash or a fungal infection?
Heat rash appears quickly in hot, sweaty areas as clusters of tiny red bumps or clear pinhead blisters with a prickling itch, and fades within a few days once you cool down. A fungal rash develops more slowly, has a scaly, ring-shaped or well-defined red edge, often sits in skin folds or between the toes, and keeps spreading until it is treated with an antifungal. If you are not sure, a doctor can usually tell at a glance.
Can I use hydrocortisone cream from a Thai pharmacy?
Mild hydrocortisone cream is reasonable for a few days on bites, contact dermatitis or eczema in adults. Do not use it on a rash that could be fungal or infected, on broken or weeping skin, or for long periods on the face. Be careful with combination creams that contain stronger steroids. If the rash is no better after a few days, see a doctor.
Is my rash contagious?
Most common holiday rashes, including heat rash, hives, bites, sun rash and contact dermatitis, are not contagious. Scabies, impetigo, hand, foot and mouth disease, and some fungal infections can spread through close contact or shared towels, and shingles blisters can pass chickenpox to people who have never had it. Until you know the cause, avoid sharing towels and bedding.
When is a rash an emergency?
Call 1669 or go to an emergency department if a rash comes with swelling of the lips, tongue or throat, difficulty breathing, widespread blistering or peeling skin, sores in the mouth and eyes with a fever, or if it does not fade when pressed with a glass in someone who is unwell. These can be signs of anaphylaxis, a severe drug reaction or a serious infection.
I have a rash and a fever in Thailand. Could it be dengue?
It could be. Dengue usually starts with a sudden high fever, headache, pain behind the eyes and aching muscles, and a rash often appears a few days later. Other infections can look similar, so a rash with fever should be checked by a doctor, who may arrange a blood test. Avoid ibuprofen and aspirin until dengue has been ruled out, and drink plenty of fluids.
Can a doctor see my rash at my hotel?
Yes. A doctor can visit your hotel or villa anywhere in Phuket, day or night, to examine the rash, start treatment and advise on follow-up. This is helpful for children, for rashes with fever, or if you would rather not travel. Message us on WhatsApp or call to arrange a visit.
Sources
NHS: Heat rash (prickly heat). NHS: Contact dermatitis. DermNet: Miliaria. CDC: Dengue.
Medically reviewed by Dr. Ponlawat Pitsuwan, Physician, Takecare Medical Clinic Phuket ยท Last reviewed 4 November 2026
This page is general health information and not a substitute for a medical consultation.