Is XERF (Serf) Right for You? Good Candidates and When to Avoid It

XERF (Serf) tends to suit improving overall firmness and texture together, while other options may suit better for severe SMAS-level sagging (ultrasound or threads may be combined).
Medically reviewed by Dr. Lee Da-in, Medical Director, Daybeau Clinic Seomyeon · Last reviewed October 2026

Often a good fit for

  • Improving overall firmness and texture together
  • Looking for radiofrequency lifting with less discomfort
  • Concern: Loss of firmness
  • Concern: Fine lines

Other options may suit better for

  • Severe SMAS-level sagging (ultrasound or threads may be combined)

Treatment may be limited or need discussion if

  • Pregnancy
  • Pacemakers or other implanted electronic devices
  • Metal implants in the area (tell the doctor)
  • Inflammation in the area

Still deciding?

Both are monopolar radiofrequency devices targeting dermal collagen. XERF is designed to reach different depths with multiple frequencies, while Thermage FLX is the long-established reference device. Skin thickness and pain sensitivity guide the choice. See the full comparison: XERF (Serf) vs Thermage FLX.

Medical notice: every procedure can cause side effects such as swelling, bruising, redness, pain, inflammation or pigmentation, and results and their duration vary between individuals. Suitability and method are decided only after a consultation with the doctor. This page is general information, not a diagnosis. Fees follow the clinic's official non-covered fee schedule.

Frequently Asked Questions

From what age can I get XERF (Serf)?

Skin condition and concerns matter more than age. Patients under 19 need guardian consent in Korea.

Who should not get XERF (Serf)?

Pregnancy, breastfeeding or inflammation in the area usually means postponing; this is decided at consultation.

When can I wear makeup after XERF?

Usually once the skin has settled after treatment.

Dr. Lee Da-in

Not sure this is the right treatment?

Send Dr. Lee's team a photo and your travel dates. We'll suggest a plan and a consultation time.

Ask on WhatsApp Call +82 51-925-7890