service / Laser-lifting
A skin firmness treatment that uses microneedle RF to address fine lines, pores, facial redness, and scars together.
Why Lisoom
XERF is a dual monopolar radiofrequency (RF) lifting device developed by Cynosure Lutronic.
It uses two frequencies, 6.78MHz and 2MHz, together: 6.78MHz heats and contracts dermal collagen, while 2MHz reaches deeper layers, allowing staged stimulation by depth.
Intelligent cooling is combined with real-time skin resistance (impedance) measurement to lower the risk of epidermal burns and adjust energy to each patient's skin.
DESIGN PRINCIPLE
Two frequencies, 6.78 MHz and 2 MHz, are used in a single device. The 6.78 MHz frequency is in the same band as Thermage and Oligio and heats dermal collagen to induce contraction and new collagen formation, while 2 MHz reaches deeper, down to the subcutaneous fat layer, allowing staged stimulation. The design makes it possible to address surface texture and deep firmness together in a single treatment.
Monopolar radiofrequency energy acts uniformly across the entire dermis to heat and contract collagen, then induces new collagen formation over the following 4-6 months. This is the standard mechanism of RF lifting, in which an immediate contraction effect and a gradual build-up of collagen appear together. Compared with Thermage, which belongs to the same RF family, the difference is that the additional 2 MHz frequency expands the depth options.
An automatic cooling system that protects the epidermis is combined with an algorithm that measures skin resistance (impedance) in real time. Because energy is adjusted automatically according to each patient's skin impedance, the risk of burns is low, and the consistent output allows a stable treatment. Thanks to this safety design, the treatment can be performed with topical anesthesia alone, without IV sedation.
The tip covers a large treatment area, so energy can be delivered uniformly to a wider area in the same amount of time. Each area can be treated thoroughly without gaps, and broad areas such as the full face, jawline, and neck can be handled comfortably. That said, the distribution of intensity is adjusted at the consultation according to the area and skin condition.
OUR PRINCIPLE
XERF is a device that adds dual frequencies and a safety design to the standard principle of RF lifting. At RESUM, as much as the specifications of the device itself, we prioritize an approach that determines the allocation of intensity and depth according to each patient's skin thickness, pain sensitivity, and distribution of sagging.
Tailored Depth
When more dermal stimulation is needed, we give more weight to 6.78 MHz; when deep firmness needs more attention, we give more weight to 2 MHz. We consider it fundamental to stable results to decide the allocation ratio of the two frequencies after assessing the patient's skin thickness and the location of sagging. Even with the same device, a different allocation leads to a different result.
Safety First
Having intelligent cooling and real-time impedance checks does not mean we run the device at maximum intensity. We adjust intensity within a safe range suited to the patient's skin condition and pain sensitivity, and prioritize cumulative stability over pushing for results in 1 session. We tend to operate in a way that lowers the burden of pain and burns so that patients can begin regular care comfortably.
Explaining Its Reach
We tell you candidly at the consultation when sagging or deep lines have reached a stage that is difficult to address with XERF alone. When sagging at the SMAS depth needs more attention, we suggest Ultherapy; when contraction of the entire dermis is needed more, we suggest Thermage or a combined approach; and if facelift surgery is more suitable at that stage, we evaluate that option as well. Not pushing XERF on patients is how RESUM practices.
XERF is a dual monopolar radiofrequency system that uses two frequencies, 6.78MHz and 2MHz, in a single device. The 6.78MHz frequency is in the same band as Thermage and Oligio and heats dermal collagen to induce immediate contraction and new collagen formation, while 2MHz reaches deeper layers, allowing staged stimulation. The design addresses surface texture and deep firmness together within a single treatment. Uses two frequencies, 6.78MHz and 2MHz · Heats and contracts dermal collagen with monopolar RF · Staged stimulation by depth (superficial and deep) · Immediate contraction + gradual new collagen formation
An automatic cooling system that protects the epidermis is combined with an algorithm that measures skin resistance (impedance) in real time. Because energy is adjusted according to each patient's skin impedance, the risk of burns tends to be low, and the aim is a stable treatment with consistent output. Because the burden of pain tends to be low, the treatment can be performed with topical anesthesia alone, without IV sedation. Real-time skin resistance (impedance) measurement · Energy adjusted to each patient's skin · Burn risk ↓ with automatic cooling · Can be performed mainly under topical anesthesia
NOTICE
PROCEDURE DATA
Treatment Overview
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Doctor's Note
Thanks to its dual-frequency design, XERF is a device that can address surface texture and deep firmness together within a single treatment. However, the device does not do everything on its own; what determines the result is how the allocation of the two frequencies is adjusted to the patient's skin thickness and distribution of sagging. I believe the standard of care is to prioritize cumulative stability within a safe range rather than excessive intensity.
PROCEDURE FLOW
01
PHASE I
We check skin thickness, the distribution of sagging, and real-time skin resistance (impedance) to set the RF treatment criteria for each patient.
02
PHASE II
We plan the allocation ratio of the two frequencies, 6.78MHz for dermal stimulation and 2MHz for deep firmness, along with the depth and number of applications.
03
PHASE III
With automatic cooling protecting the epidermis, dual-frequency RF matched to your impedance is delivered under topical anesthesia.
04
PHASE IV
We explain the immediate contraction, the new collagen changes that take place from 4-6 weeks, and the timing of booster sessions 1-2 times a year.
FREQUENTLY ASKED
We have compiled the questions patients ask most often before a consultation.
6F #601, 599-4 Sinsa-dong, Gangnam-gu, Seoul
(No lunch break on weekends and public holidays) *Dr. Won-Suk Kook is not available on the 1st and 3rd Saturdays of each month.
Parking Information Parking is available in the building. 1 hour of free parking
Subway 5-minute walk from Exit 3 of Apgujeong Station on Line 3 (right next to the 14-story CGV building at Exit 3)
