XERF in Korea: Dual Radiofrequency Lifting Explained
XERF is a monopolar radiofrequency lifting device that combines two frequencies, 2 MHz and 6.78 MHz, to heat both the dermis and deeper tissue layers for skin tightening and firmness. It uses built-in cooling and pulse control to improve comfort, and is often described as needing no needles and little or no downtime.
XERF is made by Lutronic, a Korean company that is now part of Cynosure Lutronic. It received US FDA clearance for face and neck skin tightening in 2025, and it is offered in a growing number of Gangnam clinics.
How XERF Works
Most RF devices use a single frequency. XERF combines two:
- 6.78 MHz: acts on more superficial layers of the dermis, supporting skin firmness and texture.
- 2 MHz: reaches deeper layers, including fibrous septa in the subcutaneous tissue, to support tightening and contour.
The heat contracts collagen and stimulates new collagen and elastin over the following months. According to the manufacturer, its cooling systems and pulse delivery are designed to protect the skin surface and keep treatment comfortable, and the tip pattern aims for even heating.
Who It Suits
- Early to moderate laxity on the face, jawline and neck
- People who want to treat both skin quality and deeper firmness
- Those looking for an alternative to Thermage-style RF
- People who prefer little or no downtime
It is less suitable for heavy sagging or significant volume loss, where ultrasound lifting, fillers or surgery may give more visible results.
XERF Compared With Other RF Devices
| Device | Frequency | Depth focus | Comfort features |
|---|---|---|---|
| XERF | 2 MHz and 6.78 MHz monopolar | Dermis and deeper tissue | Cooling, pulse control |
| Thermage FLX | Monopolar | Dermis and deeper tissue | Cryogen cooling, vibration |
| Volnewmer | 6.78 MHz monopolar | Dermis | Water cooling |
| Density | 6.78 MHz monopolar, plus bipolar | Dermis | Cooled tip |
Each device has a slightly different design, but they share the same basic aim: controlled heating to tighten collagen. Comfort, cost and the doctor's experience often guide the choice.
What Happens During Treatment
- Consultation: the doctor assesses laxity and agrees areas and shot count.
- Preparation: skin is cleansed. Numbing may not be needed for everyone, depending on sensitivity and settings.
- Treatment: the tip is passed over each area. You will feel warmth with cooling.
- Finishing: the skin is soothed. A full face commonly takes 30 to 60 minutes.
Results and How Long They Last
Some people notice firmer skin within days, with improvement building over one to three months. Many repeat treatment every six to twelve months, though this varies with age, skin and goals.
Recovery and Side Effects
Most people return to normal activities right away. Possible effects include:
- Redness for a few hours
- Mild swelling or tenderness
- Rarely, blisters, bumps or temporary surface irregularities
Who should avoid it
XERF may not be suitable for people with pacemakers or implanted electronic devices, metal implants in the area, pregnancy, active skin infections or inflammation, or recent procedures in the same area. Tell the doctor about fillers and threads. A licensed physician should assess you first.
Why Dual Frequency Can Matter
Skin laxity rarely sits in one layer. Fine crepiness is mostly in the dermis, while a loss of contour along the jaw or neck involves deeper connective tissue. By combining two frequencies, XERF is designed to reach both in the same session. In practice, this may mean fewer separate treatments for some people, although many Korean clinics still pair XERF with HIFU when a deeper structural lift is needed.
As XERF is newer than some established RF devices, independent long-term comparisons are still limited. It is reasonable to ask the doctor how they have found results in their own patients and what they would recommend if you have had other RF treatments before.
How to Choose
- Ask whether XERF suits your main concern compared with other RF or ultrasound options.
- Confirm the number of shots and areas included.
- Ask how often the doctor uses this device.
- Consider combining with HIFU if you also want a deeper lift.
Tips for Visitors to Korea
- XERF fits easily into a short trip; you can usually fly the next day.
- Avoid saunas, hot baths and alcohol for a day or two.
- Published prices in Gangnam start from around ₩350,000 (≈ $260), depending on shots and areas. Prices vary by clinic and change over time.
- Take before photos and compare after two to three months.
Frequently Asked Questions
What makes XERF different from other RF devices?
Its main distinction is the combination of two RF frequencies in one device, aimed at heating different depths in a single treatment.
Is XERF painful?
The manufacturer designed it for comfort with cooling and pulse control. Many people describe warmth rather than sharp pain, but sensitivity varies.
Can XERF be used on the neck?
Yes, it is used on the face and neck. The doctor will adjust settings for each area.
Is XERF suitable for all skin types?
RF does not target pigment, so it is generally considered suitable for a wide range of skin types. The doctor will still assess your skin before treatment.
How many XERF sessions do I need?
Many people have one session and then repeat it every six to twelve months for maintenance. Some doctors suggest a short series for more noticeable change. The plan depends on your skin and goals.
This article is for general information only and does not replace a consultation with a licensed physician. Results vary from person to person.
