RF Microneedling for Underarm Sweating: Evidence, Sessions and What to Expect
Medical Director Dr Sin Yong explains how RF microneedling is used for underarm sweating at IN Eternity Clinic, what the trials show and how it compares with injections.
WhatsApp to Enquire →Key facts ↓Fractional microneedle radiofrequency uses fine insulated needles to deliver heat to the deep skin, where underarm sweat glands sit. In small trials, two to four sessions a few weeks apart lowered sweating scores, and some people were still improved a year later, but a randomised trial found injections gave the larger reduction. IN Eternity Clinic offers both. See underarm sweating treatment.
- Sham-controlled trial: in 25 people with severe underarm sweating, three sessions three weeks apart lowered severity scores on the treated side compared with the sham-treated side [1].
- One year on: in the same group, 10 of the 24 followed for a year had not relapsed; relapse was linked with a higher body mass index [2].
- Pilot study: in 20 people given two sessions four weeks apart, 14 reported more than 50% improvement in sweating, and biopsies showed fewer and smaller sweat glands [3].
- Against injections: in a randomised trial in 20 people, one underarm had four RF microneedling sessions and the other a single injection treatment; injections were more effective at 12 months, and RF microneedling was more painful [4].
- Severity guides the start: expert guidance grades sweating on a four-point scale; severe underarm sweating starts with injections plus aluminium chloride [5].
How does RF microneedling reduce underarm sweating?
Underarm sweat glands sit deep in the skin, near the fat beneath it. In RF microneedling, insulated needles enter the skin to a set depth and release radiofrequency energy at their tips, so the heat is delivered at the level of the glands while most of the surface is spared. In a pilot study, skin biopsies a month after treatment showed fewer and smaller sweat glands of both main types [3].
At IN Eternity Clinic this is done on the Secret Duo. Assessment comes first: heavy sweating in both underarms that began before about 25, runs in the family and stops during sleep points to primary hyperhidrosis. Sweating that is generalised, one-sided, worse at night or new in adult life needs a GP review and blood tests instead.
What do the studies show?
The evidence comes from a handful of small studies. They agree that RF microneedling lowers sweating scores, but the groups are small and follow-up is limited, so results vary between people.
| Study | People | Sessions | What was found |
|---|---|---|---|
| Pilot study [3] | 20 | 2, four weeks apart | HDSS fell from 3.3 to 1.5 one month after; 14 of 20 reported more than 50% improvement |
| Sham-controlled study [1] | 25 | 3, three weeks apart | Treated side scored lower than the sham side: HDSS 1.87 vs 3.38 |
| One-year follow-up [2] | 24 followed | 3, three weeks apart | 10 had not relapsed; relapse was linked with higher body mass index |
| Randomised trial vs injections [4] | 20 (40 underarms) | 4 vs one injection treatment | Moderate effect, but injections were more effective at 12 months and less painful |
The trial against injections matters most for choosing. RF microneedling worked, but injections were more effective over 12 months, needed fewer sessions and hurt less [4]. RF microneedling is an alternative, not an upgrade.
How many sessions, and what is recovery like?
RF microneedling for sweating is a course rather than a single visit, with sessions a few weeks apart; the studies used two to four sessions, three to four weeks apart [1][3][4]. Numbing cream is applied for about 30 to 45 minutes first. During treatment most people feel prickling and a short burst of heat with each stamp, and underarm skin is sensitive.
Afterwards, expect redness, pinpoint bleeding and soreness for a few days after each session. Heavy exercise, hot yoga, saunas and swimming are usually avoided for two to three days. In the pilot study, side effects were mild discomfort, short-lived swelling and some darkening after inflammation [3], which matters in skin that marks easily. Because some people relapse within a year, the study authors suggested repeat sessions after a year, particularly with a higher body mass index [2].
RF microneedling or injections: which suits whom?
Antiperspirant containing aluminium chloride, applied to dry skin at night, is the usual first step for mild sweating. For severe underarm sweating, expert guidance starts with injections plus aluminium chloride [5]. Some people ask about RF microneedling because they would rather not repeat injections every few months; the trade-off is a course of more uncomfortable sessions, more days of soreness and, in the one head-to-head trial, a smaller reduction.
| Option | How it works | Trade-offs | At IN Eternity Clinic |
|---|---|---|---|
| Aluminium chloride antiperspirant | Plugs sweat ducts; applied at night | Helps mild cases; can irritate | Usually tried first |
| Underarm injections | A prescription medicine blocks the nerve signal to sweat glands | Lasts several months, then repeated; mild tenderness | Mapped and treated by Dr Sin Yong |
| RF microneedling (Secret Duo) | Radiofrequency heat at the depth of the sweat glands | A course; redness, pinpoint bleeding and soreness for days | Offered |
| Microwave thermolysis | Heats and destroys sweat glands | Swelling and numbness afterwards | Not performed here |
| Surgical sympathectomy | Surgery to the nerves that drive sweating | Risk of compensatory sweating | Not performed here |
What Dr Sin Yong looks for
- The pattern: both underarms, onset before about 25, family history and dry nights.
- Red flags such as night sweats, weight loss, fever or palpitations.
- Severity on the four-point scale, and what antiperspirant has achieved.
- Underarm skin: irritation, darkening or infection treated alongside.
- Pregnancy, breastfeeding, pacemakers or other electronic implants, and keloid tendency.
General clinical observations used at consultation; they describe what is checked, not any individual result.
Frequently asked questions
Does RF microneedling work for underarm sweating?
In small studies it lowered sweating scores, and some people were still improved a year later. In a randomised trial, injections gave the larger reduction at 12 months, so results vary and it is discussed alongside injections.
How many RF microneedling sessions are needed for sweating?
It is a course rather than one visit. Studies used two to four sessions, three to four weeks apart, and some people needed repeat treatment after about a year. Your plan is set at assessment.
How does RF microneedling compare with underarm injections?
In a randomised trial, injections reduced sweating more at 12 months, needed one session and were less painful. RF microneedling is an alternative for people who prefer not to repeat injections, with more sessions and soreness.
Is RF microneedling for sweating permanent?
Not reliably. In a one-year follow-up, 10 of 24 people had not relapsed, and relapse was linked with a higher body mass index. Repeat sessions may be needed.
Does it hurt, and what is the downtime?
Numbing cream is used, but most people feel prickling and bursts of heat. Expect redness, pinpoint bleeding and soreness for a few days, and avoid heavy exercise and saunas for two to three days.
Does IN Eternity Clinic offer miraDry?
No. IN Eternity Clinic does not perform microwave thermolysis or surgery. It offers underarm injections and RF microneedling on the Secret Duo, and Dr Sin Yong explains which suits your sweating.
Book an assessment
IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, Singapore 228210. By appointment with Medical Director Dr Sin Yong. Monday to Saturday, 11am to 8pm. WhatsApp or call +65 8815 3008. At IN Eternity Clinic a consultation fee applies, and it is waived if you go ahead with any medical treatment; the fee is S$120.
International KOL — CLASSYS · HIRONIC · DEKA · ALMA · FOTONA · LUTRONIC
References
- Fatemi Naeini F, Abtahi-Naeini B, Pourazizi M, Nilforoushzadeh MA, Mirmohammadkhani M. Fractionated microneedle radiofrequency for treatment of primary axillary hyperhidrosis: a sham control study. Australas J Dermatol 2015;56(4):279-284. doi:10.1111/ajd.12260
- Abtahi-Naeini B, Naeini FF, Saffaei A, et al. Treatment of primary axillary hyperhidrosis by fractional microneedle radiofrequency: is it still effective after long-term follow-up?. Indian J Dermatol 2016;61(2):234. doi:10.4103/0019-5154.177789
- Kim M, Shin JY, Lee J, Kim JY, Oh SH. Efficacy of fractional microneedle radiofrequency device in the treatment of primary axillary hyperhidrosis: a pilot study. Dermatology 2013;227(3):243-249. doi:10.1159/000354602
- Eid RO, Shaarawi E, Hegazy RA, Hafez V. Long-term efficacy of fractional microneedle radiofrequency versus botulinum toxin-A in primary axillary hyperhidrosis: a randomized controlled trial. Lasers Med Sci 2024;39(1):177. doi:10.1007/s10103-024-04115-x
- Solish N, Bertucci V, Dansereau A, et al. A comprehensive approach to the recognition, diagnosis, and severity-based treatment of focal hyperhidrosis: recommendations of the Canadian Hyperhidrosis Advisory Committee. Dermatol Surg 2007;33(8):908-923. doi:10.1111/j.1524-4725.2007.33192.x
These sources describe mechanisms and general evidence. They are not a promise of any individual result; suitability is decided at an in-person assessment.