Hyperhidrosis Injection in Seoul: Botox for Excessive Sweating
The short answer
A hyperhidrosis injection treats excessive sweating by placing small doses of botulinum toxin just under the skin, where it blocks the nerve signal that activates sweat glands. In Gangnam underarms typically cost ₩200,000–₩700,000 and palms ₩300,000–₩900,000. Treatment takes 15–30 minutes, dryness starts within one week, and results usually last four to nine months.
Key facts
- Treatment: intradermal botulinum toxin injections
- Areas: underarms, palms, soles, scalp, forehead
- Procedure time: 15–30 minutes
- Onset: 2–7 days
- Results last: about 4–9 months
- Typical Seoul price: ₩200,000–₩700,000 underarms; ₩300,000–₩900,000 palms
How the injection works
Sweat glands are switched on by nerve signals using a chemical messenger called acetylcholine. Botulinum toxin, injected in tiny amounts into the skin, blocks this messenger locally. The glands stay in place but stop receiving the signal, so sweating drops sharply in the treated area. The effect wears off gradually as nerve endings recover, which is why treatment is repeated.
This approach is well established for primary focal hyperhidrosis, the most common form, which usually starts in adolescence and affects specific areas symmetrically.
Treatment by area
| Area | Comfort | Typical duration | Notes |
|---|---|---|---|
| Underarms | Easy | 4–9 months | Most common and predictable |
| Palms | More uncomfortable | 4–6 months | Temporary grip weakness possible |
| Soles | Uncomfortable | 3–6 months | Nerve block often used |
| Scalp and forehead | Moderate | 4–6 months | Careful placement to avoid brow drop |
Before treatment
A doctor will confirm the type of sweating. Generalised or new-onset sweating in adulthood can have medical causes, such as thyroid problems or medication side effects, which should be checked first. For focal sweating, the clinic may perform a starch-iodine test to map the most active area.
What a session is like
After cleansing and numbing cream or ice, the doctor places many small injections in a grid, about 1–2 cm apart. Underarms take about 15 minutes and feel like small pinches. For palms and soles, clinics may use vibration, cooling or nerve blocks to reduce discomfort.
After treatment
- Small bumps fade within an hour or two
- Avoid deodorant for 24 hours
- Skip saunas, hot yoga and heavy exercise on the day
- Do not massage the area
Side effects
Bruising and tenderness are usually minor. Palm injections can cause a temporary feeling of weakness in the hands. Forehead treatment needs careful dosing to avoid affecting brow position. Compensatory sweating elsewhere is uncommon with injections, unlike some surgical treatments.
Injections vs other options
For underarms, microwave treatment such as miraDry offers a longer-lasting alternative after one or two sessions, with several days of swelling. Topical antiperspirants and iontophoresis help mild cases. For a full comparison, see our sweat reduction treatment page and miraDry or Botox for sweating.
Planning as a visitor
There is no downtime and no flight restriction. Because dryness starts after a few days, book early in your trip if you want to enjoy the effect while in Korea, especially in humid summer months. Many patients repeat once or twice a year. Ask which toxin brand is used: Korean brands are often more affordable. Our botulinum toxin injection page explains the differences.
Questions to ask
- How many units per area will you use?
- Which toxin brand is included in the price?
- What numbing do you offer for palms or soles?
This guide is for general information and is not medical advice. Prices are typical ranges reported by Gangnam clinics in 2026 and vary by clinic, doctor and treatment plan; confirm directly with the clinic.
Patient questions
Frequently asked questions
How soon does a hyperhidrosis injection work?
Sweating usually decreases within two to seven days.
How long does it last?
Typically four to nine months for underarms, a little shorter for palms and feet.
Is it safe to stop sweating in one area?
Yes. The treated areas are small, and the body continues to regulate temperature normally.
Does it work on the scalp?
Yes, scalp and forehead sweating can be treated with careful dosing.
Not sure which Gangnam clinic is right for you?
Tell us your goals, budget and travel dates. Our English-speaking coordinators compare doctor-led clinics and usually reply with free quotes within 24 hours.