Why feet smell: sweat, bacteria and closed shoes

The soles of the feet carry one of the highest densities of sweat glands on the body. Sweat itself is almost odourless; the familiar smell appears when bacteria living on the skin break down sweat and dead skin cells inside a warm, closed shoe. The medical name is bromodosis , and it affects people of every age, gender and level of cleanliness.

Several things make it worse: shoes made of synthetic materials that trap moisture, wearing the same pair two days running, nylon socks, standing for long periods, hot weather, hormonal changes, stress and certain medicines. Teenagers and people who exercise a lot are especially prone because they simply sweat more.

For visitors to Seoul, the trigger is often obvious. A typical day in Myeongdong, Insadong or around the palaces of Jongno can mean 15,000 to 25,000 steps, and Korean summers from late June to August are hot and very humid. Feet that are fine at home can start to smell after a week of sightseeing in sneakers.

Medical causes doctors look for

When odour persists despite good hygiene, there is usually a treatable medical reason. The most common is plantar hyperhidrosis , a condition in which the sweat glands of the soles are overactive regardless of temperature. People with it often have sweaty palms too, and their socks may be damp within an hour of putting them on.

The second is athlete's foot (tinea pedis), a fungal infection that causes itching, peeling or soggy white skin between the toes and changes the skin's bacterial balance. Our guide to athlete's foot treatment near Jongno covers it in detail. The third, less well known, is pitted keratolysis : a bacterial infection that leaves clusters of tiny craters on the weight-bearing parts of the sole and produces a particularly strong smell.

Less often, odour comes from a wound, an infected ingrown toenail or, in people with diabetes, an ulcer that has not been noticed. Those situations need prompt medical attention rather than deodorising products. The chart shows which signs are usually fine to manage yourself and which mean it is time to see a doctor.

What to try first: a two-to-three week self-care routine

Most foot odour responds to a consistent routine, and it is worth giving it two to three weeks before deciding it has failed. The aim is to keep skin dry, reduce the bacterial load and stop shoes becoming a reservoir for smell.

Travellers can do almost all of this from a hotel room. Korean pharmacies (yakguk, 약국) and large drugstores in Myeongdong stock foot powders, antibacterial washes and antiperspirants, and pharmacists in central Seoul are used to helping foreign visitors with simple problems.

1. Wash feet once or twice a day with soap or an antibacterial wash, then dry them completely, especially between the toes.
2. Wear cotton, wool or moisture-wicking socks and change them at least twice a day if your feet sweat a lot.
3. Do not wear the same shoes two days running; let each pair air for at least 24 hours, insoles out.
4. Apply a foot antiperspirant or powder at night to clean, dry skin so it has time to work.
5. Keep toenails short and gently remove hard skin, which bacteria feed on.
6. Go barefoot or wear open sandals at the hotel whenever you can.

Medical treatments available in Korea

If self-care is not enough, a doctor will first work out the cause, because treatment is quite different for sweating, fungus and bacteria. A short skin examination, sometimes with a skin scraping for a fungal test, is usually all that is needed. In Korea these problems are typically seen at dermatology clinics (pibugwa, 피부과) rather than a separate foot specialist.

For sweating, the first medical step is a prescription-strength aluminium chloride antiperspirant . For athlete's foot, topical antifungal creams usually work within a few weeks, with tablets reserved for stubborn or widespread infection. Pitted keratolysis responds to topical antibiotics plus measures to keep feet dry.

For moderate to severe plantar sweating, tap-water iontophoresis passes a mild electrical current through water while the feet are immersed, and is repeated several times a week at first, then less often. Botulinum toxin injections into the soles can reduce sweating for a number of months but are more uncomfortable on the feet than on the underarms. Surgery on the sympathetic nerves is reserved for rare, severe cases and carries a real risk of compensatory sweating elsewhere.

Comparing your options

The right option depends on how much you sweat, whether there is an infection, and how long you are staying in Korea. A short trip is enough to start most treatments, but iontophoresis and antifungal care usually need continuing at home, so ask for a written summary to show your own doctor.

Botulinum toxin is the same family of medicine used for wrinkles, which is why many people first hear about it through Botox treatment or Xeomin. The doses, technique and comfort for the feet are different from the face, so treatment of the soles needs a doctor experienced in hyperhidrosis.

When foot odour is a warning sign

A sudden change in smell, especially a sweet, rotten or very strong odour from one foot rather than both, can signal infection. Look for redness that spreads, warmth, swelling, pain, a wound or discharge. Anyone with diabetes, poor circulation or reduced feeling in the feet should check their feet daily and see a doctor quickly about any break in the skin; our diabetic foot care guide for Seoul explains why.

If you develop fever with a red, hot foot while travelling, go to a hospital emergency department rather than waiting for a clinic appointment. In Korea you can call 119 for emergencies, and the Korea Travel Hotline (1330) can help with interpretation and finding an international clinic.

A milder but common cause of a one-sided smell is trapped moisture under a thickened or damaged toenail. If one nail has become thick, yellow or crumbly, read our guide to thick toenail treatment in Myeongdong, because fungal nails can keep re-infecting the skin around them and the odour returns until the nail itself is treated.

Looking after your feet and skin on a Seoul trip

Plan footwear as carefully as your itinerary: pack at least two pairs of breathable walking shoes, enough cotton or merino socks for two changes a day, and a pair of sandals for the hotel. Use a foot powder in the morning on humid summer days and air your shoes by the window at night.

Long-haul flights, dry hotel air and hot, humid streets also take a toll on the rest of your skin. Many of our patients combine a walking-heavy trip with a recovery treatment such as an IV drip for fatigue or hydration-focused care for dull, dehydrated skin. If you are unsure where to start, our English-speaking clinic guide explains how consultations work for visitors.

If odour has lasted more than a month, comes with itching, peeling or wet skin even at rest, or affects your confidence, it is worth a medical visit. Bring photos of any skin changes and a list of products you have tried, so the doctor can move straight to the right test or prescription.

Frequently asked questions

Related treatments and guides

Keep reading

• Athlete's Foot Treatment Near Jongno
• Medical Foot Care Clinic in Myeongdong Seoul
• Foot Care Before Hiking in Korea
• Running Foot Recovery Treatments in Seoul
• Men's Foot Care Clinic

Sources

1. NHS – Smelly feet
2. Mayo Clinic – Hyperhidrosis: Diagnosis and treatment
3. Mayo Clinic – Athlete's foot: Symptoms and causes