XERF Lifting vs. Thermage: Mechanism, Differences, and How to Choose

When sagging skin and wrinkles start to bother you, radiofrequency (RF) lifting is often the first option that comes to mind. XERF and Thermage are the two devices most commonly compared — yet few places clearly explain how they actually differ. Here is a rundown of their mechanisms, pain and downtime, and which skin concerns each suits best.

What is RF (radiofrequency) lifting?

RF lifting delivers heat energy into the deep layers of the skin (dermis to upper SMAS) to contract collagen and, over time, trigger a regenerative response that builds new collagen. It offers firming and fine-line improvement without incisions, which is why it appeals to people who want to avoid the downtime of surgery. Thermage is the long-established device; XERF is the newer option drawing attention.

How XERF works

XERF uses dual frequencies (6.78MHz + 2MHz) to deliver heat to different depths of the skin. Combined with its Wave Fit Pulse method, it splits the energy across multiple passes — building heat up in layers rather than delivering it all at once.

• Dual frequency: distributes energy across shallow and deep layers, gentler on the surface while still reaching deeper tissue
• Pulsed delivery: because energy is not delivered all at once, pain and burning tend to feel comparatively mild
• Well suited to treating broad areas evenly, for uniform firming

6.78MHz vs 2MHz: they reach different depths

A recent computational-modeling and histologic study (Ko et al., Lasers in Medical Science, 2025) showed that the two frequencies deliver heat differently within the skin.

• 6.78MHz concentrates heat locally along the dermis and fibrous septa. Perpendicularly arranged septa showed the greatest thermal reaction.
• 2MHz, being a lower frequency, penetrates more deeply and spreads heat broadly into the subcutaneous fat layer (penetration depth is inversely proportional to the square root of frequency).

Using both frequencies — what "DEEP" means

In that study, applying both frequencies together (dual frequency) produced a more pronounced thermal reaction at the dermo-subcutaneous junction, and the changes in collagen and elastic fibers in the deep dermis and fibrous septa were more marked than with a single frequency.

Notably, adipocytes were preserved with no fat loss. Rather than reducing volume, the effect remodels the collagen and fibrous structures involved in lifting. This is why combining the two frequencies can help in areas where sagging comes with fat, such as nasolabial folds, jowls, and a double chin.

Note — evidence and limitations: This section references a study on the thermal reactions of 6.78MHz and 2MHz monopolar RF (Ko K, et al., Lasers in Medical Science, 2025). The study is based on porcine skin and computational modeling and may differ from actual responses in human skin. Results vary by individual.

How Thermage works

Thermage is a monopolar RF device with a long clinical history. It delivers strong single-frequency energy in one pass and excels at immediately contracting dermal collagen. It remains a steady choice for those who value a proven track record and an immediate tightening sensation.

XERF vs Thermage at a glance

It is about fit, not which is "better": Neither device is universally superior — they differ in how heat is delivered and how it feels. The right choice depends on your skin, pain sensitivity, and the result you want.

Pain and downtime

Both treatments may cause mild redness or a warm sensation right afterward, which usually settles quickly, and same-day washing and light makeup are often fine. Pain perception varies widely between individuals; some find XERF's pulsed delivery comparatively comfortable. That said, it depends on your pain threshold and the treatment settings.

Which one fits you?

• More concerned with loss of firmness and fine lines than heavy sagging, and prefer a gentler experience → consider XERF
• Value an immediate tightening feel and long-established clinical data → consider Thermage
• Sensitive to pain → discuss the pulsed method and anesthesia options during consultation
• Most important is an accurate assessment of your current skin → settings matched to your skin matter more than the device name

COCO Clinic's approach to XERF

Drawing on extensive experience with XERF, COCO Clinic tailors the energy level and delivery method to the skin thickness and degree of laxity in each area. Because the same device can feel and perform differently depending on the settings, we prioritize a plan matched to your skin over a fixed number of shots.

Frequently asked questions

Q. Can I have both XERF and Thermage? Depending on the goal, they can be combined or spaced apart. It is safest to decide after a consultation that considers your skin condition and recovery.

Q. How long do the results last? The collagen-regeneration response unfolds over weeks to months after treatment, and how long it lasts varies with age, skin condition, and lifestyle.

Q. How often should I have it? Many people consider maintenance once or twice a year, but the right interval is decided individually through consultation.

This column is provided for general, educational information and does not replace individual diagnosis or treatment. Suitability and results vary by individual, so please consult a medical professional.