Thermage FLX in Cheongdam & Apgujeong, Seoul

What is Thermage FLX?

Thermage FLX is the latest generation of the Thermage radiofrequency system. Instead of focusing energy at points like ultrasound devices, monopolar RF spreads heat through a volume of tissue. Delivered through a tip that cools the skin surface before, during and after each pulse, it warms the deeper dermis enough to make existing collagen fibres contract and to trigger the production of new collagen over the following months.

The practical result is skin that feels firmer and looks smoother, with an improvement in fine crepiness and mild laxity. Thermage FLX also uses a vibration function for comfort and tracks contact to deliver even energy across a treatment area. Because it acts broadly across skin rather than on a single deep layer, it is often described as improving skin quality as much as lift.

How Doje Clinic approaches Thermage FLX

At Doje, the choice between energy devices starts with diagnosis rather than brand. Dr. Byun Jeik considers four questions: at what depth is the main laxity, how much sagging is there, how much fat is present, and how elastic is the skin? Thermage FLX fits best where the problem is largely in the skin itself.

• Skin-dominant laxity – Thermage FLX is favoured where skin has thinned or loosened but deep structure is reasonably supported.
• Deep-structure laxity – Ultherapy Prime or a Doje signature thread lift may be more appropriate, sometimes alongside Thermage.
• Thin faces – RF heating is planned with fat volume in mind to protect natural fullness.
• No packages – Doje explicitly avoids applying every device to every patient.

Who it suits — and who it doesn't

• Suits people with early laxity or crepey skin who want firmer, smoother skin without injections.
• Suits those looking for a single-session treatment with minimal disruption to daily life.
• Suits maintenance alongside lifting or injectable plans.
• Less suitable for marked sagging that needs repositioning rather than tightening.
• Not suitable during pregnancy, with implanted electronic devices such as pacemakers, or with active skin infection in the area; other conditions are reviewed at consultation.

What to expect, step by step

1. Consultation: assessment of skin thickness, laxity and fat, and Mark-View 3D analysis if useful.
2. Preparation: the skin is cleansed and a temporary grid may be applied to guide even coverage.
3. Treatment: pulses are delivered in passes; most people feel brief, deep heat followed by cooling.
4. Finishing: soothing care if your skin is sensitive.
5. Follow-up: results are judged over months rather than days.

Recovery and aftercare

Most people return to normal activities immediately. Mild redness and slight swelling typically fade within hours to a day. Occasionally small areas of tenderness or temporary bumps occur and settle on their own. Keep skincare gentle, apply sunscreen and avoid saunas, hot baths and intense exercise for the first day or two. Because collagen remodels slowly, compare photographs taken before treatment with those at around three to six months.

Cost

The fee depends on the treatment areas and the amount of energy delivery planned for your skin. It is quoted after the 1:1 consultation; ask for a written quote. Korean non-covered (비급여) aesthetic fees are set per plan.

Frequently asked questions

What is the difference between Thermage FLX and Ultherapy Prime?

Thermage FLX uses radiofrequency to heat the skin broadly, improving firmness and texture; Ultherapy Prime uses focused ultrasound to reach deeper supporting layers.

Is one session enough?

Thermage FLX is commonly performed as a single session, with maintenance considered later depending on your skin.

Does it hurt?

Most people feel short bursts of deep heat with cooling in between. Comfort measures are discussed beforehand.

When will I see results?

Some tightening may be noticed early, with gradual improvement typically over two to six months.

Can Thermage treat the eye area?

Yes, Eye Thermage uses a dedicated tip for the eyelid area and is an option in Doje's Eye Program.

Related at Doje Clinic

• Eye Thermage
• Ultherapy vs Thermage
• Thermage vs Softwave
• Thread Lift vs Thermage
• Loss of Skin Elasticity
• Collagen Stimulation Explained
• Aftercare for Energy Devices

Medical information on this page is general education, not a diagnosis. Suitability, risks and the final plan are confirmed in a 1:1 consultation with Dr. Byun Jeik. Last updated 17 October 2026.