Hyperhidrosis is a severely underestimated invisible affliction — not painful, itchy, or life-threatening, but its negative impact on social, professional, and psychological well-being may exceed many visible conditions. Primary focal hyperhidrosis affects approximately 3% of the global population, typically onset at puberty and persisting lifelong. The distressing scenarios are everywhere: the other person feeling your cold damp palm during a handshake, underarm sweat stains spreading in circles on your shirt during important meetings, constant worry when wearing light-colored clothing, foot sweat odor embarrassment when removing shoes, sweat drops on keyboard screens, fingers slipping on phones… These accumulated scenarios severely undermine self-confidence. The root cause of hyperhidrosis lies in overactive sweat glands — not from deficiency or weakness, but from hyperactive sympathetic nerve signals governing sweat glands. Rappoel Dermatology near Gangnam Station, Seoul, uses Coretox botulinum toxin injection — temporarily switching off overactive sweat glands by blocking acetylcholine release, providing a safe and highly effective antiperspirant solution.
Scientific Mechanism of Hyperhidrosis — Not Weakness, But Neural Hyperactivity
- Sweat gland innervation: The human body has approximately 2-4 million sweat glands, concentrated in palms, soles, axillae, and forehead. Sweat glands are sympathetically innervated — sympathetic nerve terminals release acetylcholine (ACh), which binds muscarinic receptors on sweat glands triggering sweat secretion. Normally this system activates for thermoregulation during exercise or heat; hyperhidrosis patients’ sympathetic nerves continuously release excess ACh at normal temperatures
- Primary focal hyperhidrosis: The most common type — presenting as symmetric excessive sweating of palms, axillae, and soles without systemic disease. Pathogenesis involves sympathetic ganglion hyperexcitability with possible genetic predisposition (approximately 30-50% have family history)
- Secondary generalized hyperhidrosis: Caused by hyperthyroidism, diabetes, menopause, certain medications, or infections — requiring treatment of the underlying condition; botulinum toxin is not applicable
- Emotional hyperhidrosis: Excessive sweating triggered by stress, anxiety, or social pressure — related to sympathetic nerve overreaction to emotional stimuli. The vicious cycle: sweating → anxiety → more sweating
- Starch-iodine test grading: Rappoel uses the Minor’s starch-iodine test to precisely assess sweating area and severity — iodine solution applied, starch powder sprinkled, sweating areas turn blue-purple, with area and color depth reflecting sweat volume
Coretox Botulinum Toxin Antiperspirant Mechanism
- ACh release blockade: Coretox (Botulinum Toxin Type A) injected into sweat gland-dense areas — taken up by sympathetic nerve terminals and cleaves SNAP-25 protein (essential for vesicle fusion) — preventing acetylcholine vesicles from fusing with the cell membrane for release — sweat glands receive no secretion signal and stop producing sweat
- Selective antiperspirant: Botulinum toxin only blocks sweat glands in the injected area — systemic thermoregulation is unaffected (sweat glands outside the injection zone work normally) — no hyperthermia or compensatory hyperhidrosis elsewhere
- Coretox advantages: Manufactured by Korea’s Hugel — free of animal proteins and lactose (reducing allergy risk), low diffusion (minimal spread from injection point, minimizing impact on surrounding muscles — particularly important for palm injections to avoid hand muscle weakness)
- 5-7 day onset: ACh release is blocked immediately after injection, but already-released ACh requires days for metabolism — typically 5-7 days for significant sweat reduction (70-90% decrease), with peak antiperspirant effect at 2 weeks
- 6-9 month duration: Nerve terminals gradually sprout new synapses over 3-6 months restoring ACh release — antiperspirant effect gradually diminishes. Typically one injection lasts 6-9 months (significant individual variation), with repeated injections potentially extending duration
Rappoel Hyperhidrosis Botox Injection Treatment Protocol
- Sweating assessment and starch-iodine test (15 min): Iodine solution evenly applied to target area (palms/axillae/soles) → starch powder sprinkled → 5-minute wait → photography documenting sweating area and severity → marking severe sweating zones as priority injection areas
- Disinfection and anesthesia (20 min): Povidone-iodine preparation of target area → ice packs or vibration anesthesia for palms and soles (more painful injection sites) → axillae typically require no additional anesthesia (tolerable pain)
- Multi-point botulinum toxin injection (15-30 min): 30G/32G ultra-fine needle for uniform grid injection — axillae 10-15 points per side, 2 units per point (50-100 units per side total); palms 20-30 points per side, 1-2 units per point (50-100 units per side total); soles 20-30 points per side, 1-2 units per point (50-100 units per side total)
- Post-treatment observation and care instructions (10 min): Apply pressure for hemostasis 5 minutes → instruct no water contact or strenuous exercise for 24 hours → schedule 2-week follow-up to assess antiperspirant effect
Botulinum toxin hyperhidrosis treatment is a life-changing social lifeline — many patients say after their first treatment, I can finally shake hands confidently or I can finally wear light-colored clothing. Results in 5-7 days, 6-9 months of dryness, with twice-yearly injections for year-round relief. Located 3 minutes from Gangnam Station Exit 10, with seamless English and Chinese consultation.
Frequently Asked Questions
What’s the difference between Botox antiperspirant and antiperspirant deodorants/roll-ons?
Completely different action levels: (1) Antiperspirants (aluminum-based) — form gel-like plugs at sweat duct openings physically blocking sweat discharge. Limited efficacy (20-30% sweat reduction), effective only for mild cases, requires daily use, long-term use may irritate skin and yellow clothing. Prescription-grade 20%+ aluminum chloride is somewhat more effective but may cause irritation and itching. (2) Botulinum toxin injection — blocks sweat gland secretion signals at the neural level, with 70-90% antiperspirant efficacy, one injection lasting 6-9 months. Suitable for moderate-to-severe hyperhidrosis unresponsive to or intolerant of antiperspirants. Rappoel recommends: mild hyperhidrosis may try prescription-grade aluminum chloride first, then consider botulinum toxin if ineffective or unsatisfactory. Botulinum toxin isn’t a last resort — for hyperhidrosis severely impacting social life, choosing it directly can rapidly improve quality of life without prolonged ineffective antiperspirant trial periods.
Will Botox injection for palmar hyperhidrosis cause hand numbness or muscle weakness?
With proper technique, no muscle weakness occurs — but palm injection is indeed the most technically demanding site. Key lies in injection depth: palmar sweat glands are in the mid-dermis (approximately 2-3mm deep), while hand muscles (lumbricals, interossei) are in the deeper subfascial layer. Injection in the mid-dermis acts only on sweat glands without affecting muscles. However, palmar skin is extremely thick and dense with high injection resistance — requiring experienced physician depth control. Possible mild side effects: (1) Transient hand muscle weakness — extremely rare, caused by overly deep injection with diffusion to muscle layer, self-resolves in 2-4 weeks. (2) Finger numbness — extremely rare, from needle contacting digital nerve branches. (3) Significant injection pain — palms are among the most nerve-dense and painful injection sites; Rappoel uses ice + vibration anesthesia + 32G ultra-fine needles to reduce pain to tolerable levels. Choosing an experienced physician is key to safety.
Will compensatory sweating increase elsewhere after axillary Botox injection?
No — this is botulinum toxin’s greatest advantage over sympathectomy surgery. Endoscopic thoracic sympathectomy (ETS) cuts the sympathetic chain governing palms to stop palmar sweating — approximately 30-50% of patients develop compensatory hyperhidrosis (significantly increased sweating in other areas like the back, abdomen, thighs to compensate). Botulinum toxin only blocks sweat glands in the injected area — without altering overall sympathetic signaling — sweat glands elsewhere are completely unaffected. Injecting axillae only stops axillary sweating, injecting palms only stops palmar sweating — precise selective antiperspirant with zero compensatory risk. This is also why botulinum toxin can be repeatedly injected and used at multiple sites simultaneously safely — palms + axillae + soles can be injected the same day without interference.
How long do Botox antiperspirant results last? How often do I need injections?
Duration varies by site and individual: Axillae — antiperspirant effect typically lasts 7-9 months (axillary sweat glands are most sensitive to botulinum toxin with slower metabolism); Palms — 6-8 months; Soles — 6-7 months (thick plantar stratum corneum affects drug diffusion). The first year typically requires 2 injections (6-7 month intervals), potentially extending to once yearly in the second year (some patients report cumulative duration extension with repeated injections — possibly from partial sweat gland atrophy after prolonged inhibition). Rappoel recommends: 2-week post-injection follow-up to assess — if satisfactory (70%+ sweat reduction), schedule the second injection at 6 months; if suboptimal (under 50% reduction), dose increase or protocol adjustment may be needed. Twice-yearly injections maintain year-round dryness.
Are there contraindications for Botox hyperhidrosis treatment? Who is not suitable?
Contraindicated groups include: (1) Pregnant and breastfeeding women — while injection doses are small and locally acting, pregnancy injection is not recommended for safety. (2) Those allergic to botulinum toxin or excipients — extremely rare but requires confirmation. (3) Active infection at injection sites — such as axillary folliculitis or skin infection; must be treated before injection. (4) Neuromuscular disease patients — such as myasthenia gravis, Eaton-Lambert syndrome — botulinum toxin may exacerbate symptoms. (5) Coagulation disorders — discontinue anticoagulants (e.g., aspirin) 1 week before injection. Suitable candidates: (1) Moderate-to-severe primary focal hyperhidrosis (sweating significantly impacting social and work life). (2) Those unresponsive to or intolerant of antiperspirants. (3) Those unwilling to undergo sympathectomy or with post-surgical compensatory hyperhidrosis. Rappoel conducts detailed consultation and assessment before injection to ensure safe applicability.
Sweaty palms making handshakes embarrassing, underarm sweat soaking through shirts? Coretox botulinum toxin hyperhidrosis treatment — results in 5-7 days, 6-9 months of confident dryness!
📍 77, Seocho-daero, Seocho-gu, Seoul, South Korea
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