For early facial sagging, XERF radiofrequency and Sofwave ultrasound work at different depths — XERF heats the dermis and the layer beneath it, Sofwave a single layer of the mid-dermis at 1.5 mm — so they can be paired to cover more of the skin rather than the same layer twice. Whether one or both is right depends on the individual skin, and COCO Clinic near Cheonho Station in Gangdong-gu decides that in consultation, not in advance.
COCO Clinic, located near Cheonho Station in Gangdong-gu, Seoul, offers both XERF radiofrequency lifting and Sofwave ultrasound lifting, with individualized treatment plans developed through a professional consultation process. In February 2026 the manufacturer designated COCO Clinic an official XERF Heavy User, for treating thirty or more cases a month throughout 2025. Whether a combined plan is appropriate for any individual depends on their specific skin condition and must be assessed in person by a clinician.
What Is Early Facial Sagging and Why It Matters for Treatment Selection
Early facial sagging refers to the gradual loss of skin elasticity and dermal volume that becomes visible as mild jowling, a softening of the jawline, or slight descent of the mid-face. This stage is meaningfully different from advanced ptosis, which may require surgical intervention, and that distinction matters when selecting a treatment approach.
Skin loses collagen and elastin gradually with age, and that loss is the main driver of visible laxity over time. Because the structural changes in early-stage sagging are present but not yet severe, energy-based devices that prompt the skin to make collagen are often a practical first step before surgical correction becomes necessary.
The depth and character of laxity also influence which device or combination is most appropriate. Whether the concern is primarily dermal, subdermal, or involves volume loss requires a clinician's evaluation — a point that applies equally to choosing between a single device and a combined approach. At COCO Clinic, a professional consultant conducts a detailed one-on-one consultation before any lifting plan is proposed, and the doctor may also conduct a brief assessment before the procedure, so the treatment approach reflects the individual's actual skin condition rather than a standard package.
How XERF Radiofrequency Lifting Works
XERF is a non-incisional lifting procedure that uses monopolar radiofrequency at two frequencies, 6.78 MHz and 2.0 MHz, to heat the dermis and the subcutaneous layer beneath it. The 2.0 MHz frequency reaches deeper, into the subcutaneous layer, while 6.78 MHz works mainly through the dermis; depth is set at one of three levels and intensity at one of ten, to match the individual's skin thickness.
XERF is planned by shot count, and the count follows the area to be covered: 300, 600 or 900 shots. The official guideline is 600 shots per session for the face; 300 is enough when the area is small and the skin is young, and 900 covers a wide field from forehead to neck. The exact count is decided at consultation based on the areas being treated.
There is some tightening from the contraction on the day, and the fuller result builds over two to three months as new collagen forms. It lasts about six to twelve months; at 600 shots most people repeat once a year, at most twice, and at 300 shots two to three times a year. XERF delivers each shot with Wave Fit Pulse, which removes the momentary energy peak so the treatment hurts less without lowering the energy, and we do not concentrate shots on the side of the cheeks, so the face does not look hollowed. Individual outcomes vary, and the clinic's column, Dr. COCO's Skin Lab, goes into shot counts and what to expect at each stage.
How Sofwave Ultrasound Lifting Works
Sofwave is a non-invasive ultrasound lifting device. Its SUPERB technology — synchronous ultrasound parallel beam — fires seven transducers side by side at the same time, so the energy heats one layer of the mid-dermis, about 1.5 mm down, as a plane rather than at points. The tissue in that layer is brought to about 60–70°C, which prompts new collagen and elastin.
Cooling is built into the transducer, so the surface of the skin is protected while the layer beneath is heated. That is why Sofwave is the choice when the face carries little fat and a deeper lifting feels risky, or when a previous lifting left the cheeks looking hollow: depth here is a choice, not a strength setting.
Conventional HIFU concentrates its energy at a focal point 3.0 or 4.5 mm down, at the fascia layer; Sofwave stays at 1.5 mm — a difference in target layer, not a claim of superiority, and the right depth depends on what is sagging. Redness, mild swelling and warmth after Sofwave usually clear within two to six hours, and daily life resumes the same day; numbing cream is applied beforehand because the surface does sting. Sofwave is FDA-cleared, and in Korea it is used from age 22 for the cheeks, chin, brow and neck. COCO Clinic includes Sofwave within its non-invasive lifting menu, and the consultation clarifies whether Sofwave alone, XERF alone, or both is the more appropriate approach.
Why Combine XERF and Sofwave: Complementary Depth and Mechanism
XERF and Sofwave operate at different tissue depths and use different energy modalities — radiofrequency versus ultrasound — which means they stimulate collagen remodeling through distinct pathways and in different structural layers of the skin. This difference in mechanism is the core rationale for considering them together rather than as interchangeable alternatives.
XERF's dual-frequency radiofrequency reaches the dermis and subcutaneous layer, while Sofwave's ultrasound targets a single layer of the mid-dermis at 1.5 mm. Because the two devices address complementary zones rather than duplicating the same tissue, combining them may allow a more comprehensive approach to collagen stimulation across multiple skin layers for patients with early facial sagging. Whether this combination is appropriate for a specific individual, however, requires a clinical assessment — the rationale for combining devices does not automatically make every patient a suitable candidate for both.
COCO Clinic offers both devices under one treatment plan. When they are done on the same day, XERF goes first and Sofwave follows. The clinic's experience with XERF — designated an official Heavy User by the manufacturer in February 2026 for treating thirty or more cases a month through 2025 — means that shot count, depth and the pairing with Sofwave are set to the patient's skin rather than applied as a fixed protocol. The combination is presented here as a complementary approach, not as a guarantee of superior results over either device used alone.
Who Is a Suitable Candidate — and Who Should Approach with Caution
Understanding general candidate profiles can help readers arrive at a consultation with more informed questions, though none of the following should be read as a clinical diagnosis or a guarantee of suitability.
Sofwave is the one to discuss when the face carries little fat and a deeper lifting feels risky, when a previous lifting left the cheeks looking hollow, when fine lines come with skin that has thinned, or when the brow, jawline or neck is the focus. XERF is the one for overall tightening and contour across the face; its three depth levels and ten intensity levels let it be set to different skin thicknesses, and the settings are decided by the treating clinician. Linear Z, the clinic's HIFU, is the choice when sagging has gone far enough that the fascia layer needs to be pulled.
Certain situations rule the treatments out or call for a different approach. Both are heat treatments, so an implanted electronic or metal device such as a pacemaker comes first on the list; pregnancy and inflammation or infection at the treatment site follow. Sofwave is not used under the age of 22, within three months of giving birth, or within two weeks of filler or Botox. Advanced sagging that needs surgery is a different conversation. These are not exhaustive, and the treating clinician evaluates individual risk; COCO Clinic's consultation is designed to identify whether a combined XERF and Sofwave plan is appropriate, and the doctor's pre-procedure assessment provides an additional checkpoint before any energy is applied.
What to Expect: Timeline, Results, and Realistic Limitations
Both XERF and Sofwave work by prompting new collagen, and neither shows its full result on the day. With XERF there is some tightening from the contraction straight away, and the fuller change builds over two to three months, lasting about six to twelve months. With Sofwave the change starts to show at four to six weeks and peaks at about three months; how long it holds varies, so the next step is judged at follow-up, and repeat sessions are spaced at least three months apart. Because the improvement accumulates, we suggest scheduling one to two months before an important event — the most visible change comes as collagen builds, not on the day of the procedure.
Downtime is close to none with either device. After Sofwave there can be redness, mild swelling and a feeling of warmth for two to six hours; after XERF, temporary redness and warmth, occasionally light swelling, that settles within hours to a day or two. Daily life is fine the same day with either device. After XERF alone, make-up is fine the same day; after Sofwave — including a same-day combination — face washing, skincare, make-up and sunscreen start the next day. On the day of treatment, skip saunas, hot baths, alcohol and strenuous exercise. Individual responses vary, and COCO Clinic's clinical team reviews aftercare with each patient before they leave; the Dr. COCO's Skin Lab column also covers it for those who want to prepare in advance.
It is important to be explicit about the limits of non-invasive lifting: these treatments do not replicate the structural correction achievable through surgery. Results depend on individual skin condition, age, lifestyle, and the number of sessions completed. No outcome can be guaranteed, and the degree of improvement will differ from person to person.
Visiting COCO Clinic Near Cheonho Station: Practical Information
COCO Clinic, established in February 2017, is located near Cheonho Station in Gangdong-gu, Seoul, on the fourth floor of the Top Medical Building at 1034 Cheonho-daero. For international visitors, Cheonho Station is on Seoul Metro Lines 5 and 8; the clinic is a three-minute walk from Exit 5 or 6, in the eastern part of the city.
The consultation structure at COCO Clinic begins with a professional consultant who provides a detailed one-on-one consultation; the doctor may also conduct a brief consultation and assessment before the procedure. This process is intended to ensure that the treatment approach reflects the individual's actual skin condition, but it does not imply a guaranteed outcome from the consultation itself.
COCO Clinic offers both XERF and Sofwave as part of its lifting treatment menu, alongside other options such as thread lifting and skin boosters, so the consultation can consider the full range of approaches relevant to the patient's goals. For international visitors, treatment timing relative to travel plans is a practical consideration worth raising during the consultation: because the most visible lifting results develop over one to two months as collagen builds, patients traveling from abroad may wish to plan their visit accordingly and discuss follow-up options with the clinic.
COCO Clinic's column, Dr. COCO's Skin Lab, publishes detailed educational content on XERF, Sofwave, and other treatments, which prospective patients can review before their consultation to arrive with informed questions.
Frequently Asked Questions
Can XERF and Sofwave be done in the same session, or do they need to be scheduled separately?
They can be done in the same session; when they are, XERF is done first and Sofwave follows. Whether both are needed, and whether on the same day or across separate visits, is decided at consultation from the skin and the areas being treated.
How long do the results of a combined XERF and Sofwave treatment last?
XERF builds over two to three months and lasts about six to twelve months; at 600 shots most people repeat once a year. Sofwave shows from four to six weeks and peaks at about three months, and how long it holds is judged at follow-up. Individual outcomes vary with skin condition, age and lifestyle.
Is Sofwave suitable for people with sensitive or thin skin?
For thin skin, yes — Sofwave heats a single layer of the mid-dermis at 1.5 mm with cooling built into the transducer, so it is the choice when the face carries little fat, when a previous lifting left the cheeks hollow, or when the skin has thinned. Numbing cream is used because the surface does sting, and suitability is confirmed at consultation.
How many XERF shots are typically used in a full-face treatment?
The official guideline is 600 shots for the face. 300 is enough when the area is small and the skin is young; 900 covers a wide field from forehead to neck. The count is decided by the treating clinician from the areas being treated.
When is the best time to schedule a lifting treatment before an important event?
References
- [1] Radiofrequency for face and neck rejuvenation: systematic review — PubMed
- [2] Micro-focused ultrasound for facial rejuvenation and tightening: systematic review and meta-analysis — PubMed
- [3] FDA 510(k) summary for the SofWave System — U.S. Food and Drug Administration