Which skin types suit XERF? — Skin it suits, skin it suits less, and when another approach comes first
“Will XERF suit my skin?” Answering “Yes, it suits everyone” would not be accurate. XERF is a device that tightens tissue with heat, so it suits faces that have tissue to tighten, and where that tissue has room to respond to heat. This article sorts skin conditions three ways and sets out when we consider XERF first and when we put another approach first. The classification below is Miso Clinic’s clinical judgement, not a criterion from comparative studies.
The short answer
Skin that suits XERF is a face where skin texture and firmness have declined, sagging is mild to moderate, and laxity rather than hollowing is the main problem. For hollow cheeks or temples we consider support with filler first; for sagging deep enough that the skin folds, a surgical consultation first; and if pigment is the main concern, it is not a XERF indication. Age was not a significant predictor of RF response; tissue mobility was the sole significant one (Sasaki 2007, 25 people). Miso Clinic (4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu, South Korea; +82-53-428-2700) judges whether XERF fits by layer and concern rather than by age (clinical judgement).
Which skin does XERF suit well?
XERF tightens collagen with heat and stimulates renewal. So the more of the following conditions overlap, the sooner we consider it (clinical judgement).
| Condition | Why |
|---|---|
| Declining skin texture · firmness is the main concern | It is a problem on the dermal side, where the heat reaches |
| Sagging is mild to moderate | There is room to tighten tissue and refine the contour |
| Tissue that follows easily when lifted by hand | Of the factors that predicted RF response, mobility was the significant one (Sasaki 2007) |
| A face that needs to be designed area by area | The four effectors allow design by area size |
| Volume is relatively well preserved | Less risk of looking hollow after tightening with heat |
The subjects of the XERF studies overlap with this range. Hwang 2025 studied 20 women aged 28–63 (Fitzpatrick III · IV), Weiss 2026 39 people, and Erlich 2026 the lower face in 16 people. None has a control group.
Which skin does XERF suit less?
It is not that XERF cannot be done, but there are faces where XERF alone easily falls short of expectations.
| Condition | Why it fits less | What we look at alongside |
|---|---|---|
| Very thin, translucent skin | The dermis that responds to heat is thin, and the surface burden is greater | Effector size · order with boosters — XERF for thin skin |
| Hollowing mixed with sagging | Heat does not create volume | Filler first — XERF for cheek sagging |
| Heaviness under the jaw | It may be a matter of fat, muscle or bone | Sort out the cause first — Jawline sagging and XERF |
| Deep sagging | It may be beyond the range that tightening can reach | Consider adding a thread lift |
“Suits less” does not mean forbidden; it means the order and combination need rethinking.
When does another approach come before XERF?
In the following cases we do not put XERF first (clinical judgement).
- Hollow cheeks or temples are the main concern — tightening a hollow area with heat can make it look more hollow. We consider support with fillers first. Cheek sagging: what has descended
- Sagging deep enough that the skin folds — it is beyond the non-invasive range. We recommend a surgical consultation.
- Melasma or pigmentation is the main concern — XERF is not a device for treating pigment. Miso Clinic does not have a melasma laser.
- Sagging tissue needs to be moved directly — we consider adding an absorbable thread lift (mainly Hugel Blue Rose · HansBiomed MINT).
To choose from the whole range of lifting approaches, see Lifting for facial sagging: which layer.
Does XERF not suit older people?
We do not draw the line by age alone. In a study that followed 25 people for 12 months, tissue mobility was the sole factor that predicted RF response, and age was not a significant predictor (Sasaki 2007). The sample is small, so it cannot be taken as settled, but a criterion such as “XERF from a certain age” has no basis.
| What we look at | How we check |
|---|---|
| How far the tissue lifts | Whether it follows when lifted by hand |
| Skin thickness | Whether it is thin and translucent, or thick |
| Whether there is hollowing | Shadows at the cheeks, temples and under the eyes |
| Amount of fat | Fullness under the jaw and in the lower face |
The age range in the XERF studies was also wide, at 28–63 (Hwang 2025). However, no XERF study has reported results broken down by age group.
Why do we look at skin thickness and the fat layer differently for each person?
Even in the same area of the face, layer thickness varies greatly from person to person. In 3D measurement of 30 cadavers, facial skin was 2.1 ± 0.4 mm and superficial fat 5.2 ± 1.9 mm (Lee 2021). This means the variation in superficial fat is much greater than in skin.
In an ultrasound analysis of 200 people, the more the submandibular area sagged, the thinner the skin and the thicker the superficial fat (Kwon 2022). In a simulation study, XERF’s 2 MHz heated the fat layer broadly and deeply (Ko 2025, not a human study), and we do not assume the same setting will give the same result in people with thick and thin fat layers (clinical judgement). So we look at skin thickness and the amount of fat first, then decide the effectors and how the shots are distributed.
How do we check in consultation whether XERF suits you?
Miso Clinic usually runs a XERF consultation in this order (clinical judgement).
- 1Sort the concernFirst we sort which is the main concern: texture and firmness, sagging, hollowing, fat or pigment.
- 2Check the tissueWe look directly at skin thickness, how far the tissue lifts, and where any hollowing is.
- 3Decide the approachWe choose among XERF alone, XERF + boosters, filler first, or another approach.
- 4Design the effectorsE40 and E60 for broad areas, i10 for narrow areas, i05 around the eyes.
- 5Look againWe look at the face again at around 3 months, when the result has settled.
A column that approaches which faces suit XERF from another angle is Density or XERF for sagging or firmness, and the map of all our XERF columns is XERF lifting in Daegu: which skin it suits.
Skin that suits XERF: frequently asked questions
Which skin does XERF suit well?
We consider it first for faces where skin texture and firmness have declined, sagging is mild to moderate, and laxity rather than hollowing is the main problem (clinical judgement).
My cheeks are hollow — can I have XERF?
If hollowing is the main concern, we do not put XERF first. Heat does not create volume, and tightening a hollow area can make it look more hollow, so we consider support with filler first.
Does XERF suit people in their 50s and 60s?
We do not decide by age alone. What predicted RF response was tissue mobility, and age was not a significant predictor (Sasaki 2007, 25 people).
If my skin is thin, can I not have XERF?
It is not ruled out, but XERF alone may be a weaker fit. We design the effector size and the order with boosters together (clinical judgement).
Can XERF improve melasma?
XERF is not a device for treating pigment. Miso Clinic does not have a melasma laser.
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 page
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.
| Medical director | Lee Chi-Hak, MD |
|---|---|
| Address | 4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu, South Korea · Exit 1, Kyungpook National University Hospital Station |
| Phone | +82-53-428-2700 |
| Hours | Weekdays 11:00–19:00 (lunch 13:00–14:00) / Saturday 10:00–16:00 (no lunch break) / Closed Sundays and public holidays |
| Columns | All clinical columns |
| Reference library | All booster and device references |
References
- Factors that predicted response — Sasaki G et al., Aesthetic Surg J 2007;27(4):376–387 (25 people, mean age 52.3, 12 months). Tissue mobility was the sole significant predictor; age was not a significant predictor. The sample is small.
- 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.
- Individual 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.
- Ultrasound of lower-face layers — Kwon SH et al., Dermatologic Surgery 2022;48(5):527–531, PMID 35093961. Retrospective analysis of 200 people. In sagging submandibular areas the skin was thinner and the superficial fat thicker.
- XERF heating by frequency — Ko K et al., Lasers Med Sci 2025, PMID 41315066. Finite-element simulation and porcine tissue. 2 MHz heated the fat layer broadly and deeply; 6.78 MHz heated locally along the fibrous septa. Many of the authors are employees of the manufacturer, and this is not a human study.
- 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). Classified in Korea as a general-purpose electrosurgical unit; advertising marking “General-purpose electrosurgical unit combination-2024-16-054”.
- 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.
- 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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