Thermage FLX vs Ulthera Prime at a glance

Both are single-session, non-surgical lifting treatments with no real downtime. The key difference is depth and energy type: Thermage FLX uses radiofrequency to tighten the skin itself, while Ulthera Prime uses focused ultrasound to lift the deeper support layer underneath.

Feature	Thermage FLX	Ulthera Prime
Technology	Monopolar radiofrequency (Solta Medical)	Microfocused ultrasound with real-time imaging (Merz)
How it works / target depth	Broad, even heating of the deep dermis and the fibrous bands beneath it	Focused thermal points at about 4.5, 3.0 and 1.5 mm, reaching the SMAS layer
Best for	Crepey or thinning skin, fine lines, eyelids, overall firmness	Jowls, brow, under-chin fullness and jawline definition
Comfort	Pulses of deep heat eased by cooling and vibration; numbing cream used	Deep, sharper heat over bony areas; numbing cream used; usually the more intense of the two
Downtime	None to minimal (mild redness)	None to mild swelling or tenderness
Sessions	Usually one; repeat every 12–18 months	Usually one; repeat about once a year
Results appear	Some firming the same day; main change at 2–6 months	Gradual; peak at 2–3 months
Results last	About 12–18 months	About 12 months or longer
Price from at Dernia	₩990,000 (300 shots, face)	₩390,000 (100 lines)

How Thermage FLX works

Thermage FLX delivers monopolar radiofrequency through a single-use treatment tip. The energy spreads through the deep dermis and the fibrous bands below it, heating a broad volume of tissue rather than individual points. Collagen contracts with the heat, so some firming can show the same day, and new collagen builds over the next two to six months.

The tip adjusts energy pulse by pulse, while cryogen spray and vibration protect the surface. Because the effect is spread evenly, Thermage excels at texture, crepiness and overall firmness, including on the eyelids.

How Ulthera Prime works

Ulthera Prime is the latest Ultherapy platform. It focuses ultrasound energy into tiny thermal points at set depths, including 4.5 mm, which reaches the SMAS: the muscle and connective-tissue layer a surgeon tightens during a facelift. Each point heats to a coagulation temperature while the skin surface stays intact.

Real-time imaging lets your doctor see the tissue layers on screen and place energy precisely, which matters along the jawline and neck. The treated points remodel over two to three months, giving a gradual lift of the brow, jowls and under-chin.

Choose Thermage FLX if…

Your main concern is skin quality: crepey texture, fine lines or a general loss of firmness
You want to treat the upper and lower eyelids
Your skin is thin and there is little deep tissue descent to lift
You want a treatment most people find more tolerable, with cooling built in

Choose Ulthera Prime if…

You see heaviness and descent: early jowls, a lower brow or fullness under the chin
You want a sharper jawline and neck contour rather than surface smoothing
You value imaging-guided treatment that targets the SMAS layer precisely
You are comfortable with a sensation that can feel intense over bone

Can you combine them?

Yes, and it is a popular plan in Korea. Working at different depths, Ulthera lifts the foundation and Thermage tightens the skin over it. Many doctors perform both on the same day, usually Ulthera first and Thermage second, which suits a short trip to Seoul. Others space them two to four weeks apart if your skin is sensitive. Our guide to combining Thermage and Ulthera explains the reasoning, and the Seoul Signature Lifting package(from ₩1,290,000) brings both together with a soothing finish.

Cost comparison

At Dernia Clinic Myeongdong, Thermage FLX starts from ₩990,000 for 300 shots on the face, and Ulthera Prime starts from ₩390,000 for 100 lines. These are not like for like: 100 lines covers a small zone such as the under-chin, while a full face and jawline usually needs several hundred, so full-face costs are closer than they first look. Compare plans on the Thermage FLX price page and the Ulthera Prime price page. Prices are in Korean won (KRW), exclude 10% VAT, and are confirmed at your consultation.

How our doctors decide

Your doctor first works out where the change is coming from: loose, crepey skin or descending deeper tissue. Skin thickness, facial fat, bone structure and age all shape the plan. Thin, crepey skin with little descent points to Thermage, heavier tissue with a softening jaw points to Ulthera, and a mix points to a combination.

Neither is done during pregnancy or over active skin infection, and RF is not used if you have a pacemaker or other implanted electronic device. Tell your doctor about recent fillers or threads. See what each typically achieves on the Thermage FLX results and Ulthera Prime results pages, browse more matchups in our treatment comparisons, or book a consultation and a licensed doctor will recommend one device, or both.

Is Thermage or Ulthera more painful?

Most people find Ulthera more intense, especially over the jawbone and brow, because the energy is concentrated into deep points. Thermage feels like pulses of strong heat softened by cooling and vibration. Numbing cream is used for both, and your doctor adjusts the energy to your comfort.

Which lasts longer, Thermage or Ulthera?

They are similar. Thermage FLX results commonly last about 12–18 months and Ulthera about 12 months or longer. Age, skin quality, weight change and sun exposure all influence how long either one lasts.

Which is better for jowls?

Ulthera is usually the first choice for jowls because it reaches the SMAS layer that supports the lower face. Thermage helps when the jowl is partly loose skin. When both are present, combining them gives the most complete result.

Can I have both treatments during one trip to Seoul?

Yes. Many patients have Ulthera and Thermage on the same day, since neither has real downtime, and you can usually fly the next day. Your doctor confirms the order and energy settings at your consultation.

Which is better for the eye area?

Thermage FLX has a dedicated eye tip used on the upper and lower eyelids to soften crepey skin and mild hooding. Ulthera is used along the brow for a subtle brow lift rather than on the eyelids themselves.

Treatments compared

Thermage FLX — monopolar RF tightening for face, eyes and neck
Ulthera Prime — imaging-guided ultrasound lifting at the SMAS layer
Shurink Universe — Korean HIFU at a lower price point

Price, results and reviews

Thermage FLX price in Seoul — shot plans from 300 shots
Ulthera Prime price in Seoul — line-based plans
Thermage FLX review — our medical team's honest verdict
Ulthera Prime review — pros, cons and value

Guides and FAQs

Korean lifting treatments explained — HIFU, RF and laser in one place
Does Thermage FLX hurt? — what the heat feels like
How long does Ulthera last? — realistic longevity

More comparisons

HIFU vs RF lifting — the technologies behind both devices
Thermage FLX vs Oligio X — original vs Korean RF

Dernia Clinic Myeongdong

Thermage FLX vs Ulthera Prime: Which Is Right for You?