Miso Clinic · Clinical column

XERF for thin skin: can you still have it? — Thickness sets the settings

“My skin is thin — can I have radiofrequency?” We are asked this a lot. The short answer is that thin skin is less a reason not to have XERF than a reason to set the tip, heat and anaesthesia differently. However, there is no XERF study that looked at thin skin separately, so in this article we have kept what is confirmed apart from what is not.

Clinical column About 5 min October 2026 Miso Clinic, Daegu · Dr. Lee Chi-Hak, Medical Director

The short answer

XERF for people with thin skin is less a question of ‘can I have it’ than of setting ‘which tip, up to what heat, with what anaesthesia’ differently. There is no evidence that skin thickness predicts lifting response (in a 25-person study tissue mobility was the single significant factor), and no XERF study looking at thin-skinned patients separately was identified. If a thin dermis itself is the main concern, a skin booster may fit the direction better than radiofrequency. Miso Clinic (4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu, South Korea; +82-53-428-2700) divides thin areas among small effectors and proceeds while checking heat, with anaesthesia that does not block the pain signal completely (clinical judgement).

How is ‘thin skin’ judged?

Facial layer thickness varies greatly between people and between areas. In 3D measurements of 30 cadavers, skin was 2.1 ± 0.4 mm and superficial fat 5.2 ± 1.9 mm (Lee 2021). In ultrasound data from 200 people, sagging areas under the jaw had thinner skin and thicker superficial fat (Kwon 2022).

But we could not identify any source that proposes a cut-off such as “thin skin is below so many mm”. So Miso Clinic judges not by a single number but by palpation of each area, skin texture, visible blood vessels and whether there is hollowing (clinical judgement). Lifting and skin thickness in general are set out in Skin thickness, fat volume and lifting.

Does thin skin make XERF less effective?

There is no evidence to say so. In a study that followed 25 people (mean age 52.3) for 12 months after radiofrequency lifting, the single factor that predicted response was how much the tissue moves (mobility), and age was not a significant predictor (Sasaki 2007). It has the limitations of a small sample and an older device.

Equally, there is no evidence that “thin skin responds better”. In the three XERF human studies (20 · 39 · 16 people, none with a control group) we could not identify any data split by skin thickness. So Miso Clinic uses skin thickness less to predict effect than as a criterion for settings and safety (clinical judgement).

What do we take particular care about with thin skin?

What we take care about with thin skin
WhatWhat is confirmedWhat we do in the design (clinical judgement)
Fat atrophy1–4 months (mean 2 months) after treatment, about 4 per 10,000 treatments reported. Heavy anaesthesia noted to block pain feedback (Narins 2006)We do not use anaesthesia that blocks the pain signal completely
Epidermal injury (blistering · burns)With an older high-energy device, blistering 2.3% immediately, second-degree burns 0.36% (Fitzpatrick 2003) — not a current incidenceWe set the output while checking heat through conversation
Where heat concentrates2 MHz heats the fat layer broadly and deeply, 6.78 MHz locally along the fibrous septa (Ko 2025, computer simulation · porcine tissue)We do not stack heat over areas where fat is thin

Figures from older devices show the direction of “this can happen”, and cannot be carried over as the incidence for XERF today. XERF side effects in general are in XERF side effects, read as a timeline.

How is XERF adjusted for thin skin?

What can be changed with XERF is the effector, where and how much heat goes in, and the level of anaesthesia. Miso Clinic has all four effectors.

  • We divide the tips. Narrow, thin areas such as around the eyes get the i05, narrow areas the i10, and broad areas of the face E40 · E60 (clinical judgement). There are no confirmed data on differences in effect by XERF tip size.
  • We set it by heat. Rather than filling a shot count decided in advance, we proceed while checking heat area by area.
  • Anaesthesia, not too much. In a 20-person XERF study, pain without anaesthesia was VAS 4–5 (Hwang 2025). Miso Clinic adjusts it to a level that does not block the pain signal completely (clinical judgement).
  • We avoid hollow areas. We do not stack heat over areas where thin skin and hollowing overlap.

Choosing tips is covered in XERF handpieces: how to choose, and precautions in XERF side effects and precautions.

Does XERF make a thinned dermis thicker?

XERF works by tightening tissue with heat. We could not identify XERF human data showing a thicker dermis. What the XERF studies looked at were photographic assessment, GAIS and satisfaction, and the longest follow-up was about 3 months.

If a thin, dull dermis itself is the main concern, skin boosters, which add material to the dermis or stimulate collagen production, may fit the direction better (clinical judgement). Miso Clinic offers Rejuran, Rituo, Cellredm, Gouri, Juvelook and others, and the criteria for choosing are set out in Which skin booster should I choose?. If thin skin comes with dryness, see also Anti-ageing treatment for thin, dry skin.

What do we watch for after treatment?

Radiofrequency that does not break the epidermis had little effect on the barrier. In a study of 150 women there was no meaningful change in transepidermal water loss (Skalska-Stochaj 2022). We do not rush to judge results. In an RF study, clinical assessment was not significant at 4 weeks and was significant at 12 · 24 weeks (Cosmetics 2024, no control group).

  1. Same dayAvoid hot saunas · hot packsThe aim is not to add heat stimulus.
  2. A few daysCheck for burning · blistersIf one spot keeps burning, or a blister · scab forms, contact us straight away.
  3. 1–4 monthsCheck for spots that sinkFat atrophy appears at around 2 months on average (Narins 2006).
  4. After 3 monthsWe look at the face againThe longest follow-up in the XERF studies is about 3 months, so we decide the next step around then (clinical judgement).

XERF for thin skin: frequently asked questions

Should I avoid XERF if my skin is thin?

No. Thin skin is less a contraindication than a reason to set the tip, heat and anaesthesia differently. However, if a thin dermis is the main concern, a skin booster may come first.

Is XERF less effective on thin skin?

There is no evidence of that. In a 25-person study the single factor that predicted response was tissue mobility, and we could not identify a XERF study looking at thin skin separately.

Which side effect needs particular care with thin skin?

We look at fat atrophy first. Older data report about 4 per 10,000 treatments, appearing at around 2 months on average, and heavy anaesthesia has been noted to block the pain signal.

Is thin skin treated with a small tip?

Narrow, thin areas such as around the eyes get the i05, and narrow areas the i10 (clinical judgement). There are no confirmed data on differences in effect by XERF tip size.

Does XERF make thin skin thicker?

We could not identify XERF human data showing that. XERF works by tightening tissue, and a thin dermis may fit the direction of skin boosters better.

Where can I have a XERF consultation in Daegu?

Miso Clinic is at 4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu, in front of Exit 1 of Kyungpook National University Hospital Station. +82-53-428-2700. Weekdays 11:00–19:00, Saturdays 10:00–16:00 (no lunch break); closed Sundays and public holidays.

Read next

Product pages

Related: XERF product information

Who wrote this

Written and reviewed by Lee Chi-Hak, MD, director of Miso Clinic, Daegu. The treatment standards and injection design set out here are the ones we use in practice.

Miso Clinic
Medical directorLee Chi-Hak, MD
Address4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu, South Korea · Exit 1, Kyungpook National University Hospital Station
Phone+82-53-428-2700
HoursWeekdays 11:00–19:00 (lunch 13:00–14:00) / Saturday 10:00–16:00 (no lunch break) / Closed Sundays and public holidays
ColumnsAll clinical columns
Reference libraryAll booster and device references

References

  1. XERF specifications — Lutronic published data: monopolar, 6.78 MHz + 2 MHz, handpieces i05 (5 × 10 mm · 400 shots) · i10 (10 × 10 mm · 300 shots) · E40 (20 × 20 mm · 600 shots) · E60 (20 × 30 mm · 600 shots). In Korea the device is approved in the general-purpose electrosurgical unit class; the mark “2024-16-054” seen on promotional material is a medical advertising pre-screening number, not an approval number.
  2. Three XERF human studies — Hwang JK, Medical Lasers 2025;14(1):23–30 (20 subjects · one session · 12 weeks) · Weiss RA et al., Cureus 2026;18(3):e104546, PMID 41930066 (39 subjects · two sessions · 90 days, manufacturer support) · Erlich G et al., Lasers Med Sci 2026;41(1), PMID 42611100 (retrospective, 16 subjects · one session · 3 months). None of the three has a control group.
  3. Variation in facial layer thickness — Lee KW et al., Clinical Anatomy 2021;34(7):1050–1058, PMID 33583088. 3D measurement of 30 embalmed cadavers: skin 2.1 ± 0.4 mm, superficial fat 5.2 ± 1.9 mm.
  4. Lower-face layers on ultrasound — Kwon SH et al., Dermatologic Surgery 2022;48(5):527–531, PMID 35093961. Retrospective analysis of 200 people. Sagging areas under the jaw had thinner skin and thicker superficial fat.
  5. What predicted response — Sasaki G et al., Aesthetic Surg J 2007;27(4):376–387 (25 subjects, mean age 52.3, 12 months). Tissue mobility was the single significant factor; age was not a significant predictor. The sample is small.
  6. Fat atrophy — Narins RS et al., Dermatol Surg 2006;32:115–124. Appears at 1–4 months (mean 2 months), about 4 per 10,000 treatments. Notes that heavy anaesthesia blocks pain feedback.
  7. Timing and frequency of RF adverse effects (older device) — Fitzpatrick R et al., Lasers Surg Med 2003;33:232–242 (86 subjects): blistering 2.3% immediately · 3.8% within 72 hours; second-degree burns in 21 of 5,858 treatments (0.36%) — figures for the 2002 high-energy single-pass technique, not a current incidence.
  8. XERF heating by frequency — Ko K et al., Lasers Med Sci 2025, PMID 41315066. Computer simulation · porcine tissue. 2 MHz heated the fat layer broadly and deeply; 6.78 MHz heated locally along the fibrous septa. The majority of the authors work for the manufacturer, and it is not a human study.
  9. Non-invasive RF and the skin barrier — Skalska-Stochaj A et al., J Clin Aesthet Dermatol 2022;15(12):22–27 (150 women): no meaningful change in transepidermal water loss. For microneedle RF, Wu X et al., Dermatol Ther 2022 (20 subjects): raised on day 3, recovered by days 5–7.
  10. Timeline of RF results — Cosmetics 2024;11(3):71 (20 Korean women: clinical assessment not significant at 4 weeks · significant at 12 and 24 weeks; device-measured elasticity from 4 weeks) · Weiss 2026 (84.6% at 30 days → 92.3% at 90 days) · Fitzpatrick 2003 and Edwards AF et al., Dermatol Surg 2013;39:104–110 (peak at 4–6 months). None has a control group.
  11. Medical advertising law — Medical Service Act of Korea, Article 56(2), which prohibits testimonial advertising, comparison with other clinics, superlative claims and advertising that guarantees or implies a guaranteed treatment effect.
  12. Miso Clinic practice guidance — indication criteria, site-by-site design, and the explanation and consent procedure. This is the source for every sentence marked as clinical judgement.

Everything in this column is general information and does not replace medical diagnosis or treatment. Effects and side effects vary with individual skin condition, age and underlying illness, and the same result is not guaranteed for everyone. Any decision to proceed should be made in an in-person consultation with a physician.

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