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Clear explanations from a board-certified plastic surgeon.

English articles are rewritten from our Korean columns as they are reviewed. 132 articles are available in Korean →

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Oct 20, 2026

How Thermage FLX tightens skin: broad heat below a cooled surface

Thermage is the original monopolar radiofrequency device and still the benchmark. An insulated electrode and a cooling spray keep the surface cool while the heat fills the deep dermis and reaches the fibrous septa below it. Collagen contracts at once and rebuilds over months, improving loose skin and fine lines.

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Oct 19, 2026

How Ultherapy tightens skin: focused heat at depth, guided by real-time imaging

Ultherapy is a microfocused ultrasound device that focuses sound energy on a single point at a set depth and heats it. The 3.0 mm and 4.5 mm transducers do most of the work, reaching the superficial fat, the fibrous septa, and the SMAS. Several focused ultrasound devices exist, but only Ultherapy shows the tissue on a live image while it treats. It works for mild to moderate sagging.

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Oct 18, 2026

Why the face sags with age: what changes in each layer, from skin to bone

Facial aging is not only a skin problem. The skin loses elasticity, the superficial fat sags, the SMAS and retaining ligaments loosen, the deep fat deflates, and the bone recedes. What we see as an aging face is the sum of these separate changes.

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Oct 17, 2026

How Sofwave tightens skin: parallel ultrasound heat at 1.5 mm

Sofwave is an FDA-cleared ultrasound skin tightening device. Parallel beams make cylinders of heat 1.5 mm deep in the dermis, and the heat stays at that depth. New collagen and elastin follow, softening fine lines and firming the skin. Most people return to their routine the same day, and the result builds over months.

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Oct 16, 2026

Ultherapy PRIME vs. the original: a new console, the same ultrasound

Ultherapy PRIME is the original Ultherapy with a new console. The ultrasound energy, handpiece, and transducers are unchanged, while the console has a bigger screen and, by the manufacturer's account, faster processing and a shorter boot time. One unblinded survey at a single clinic reports less pain, but that gap is hard to attribute to the device. No head-to-head comparison has been published, so the lifting effect is best assumed to be the same.

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Oct 15, 2026

Sofwave vs. Ultherapy: which layer each one treats

Sofwave heats the dermis at 1.5 mm, and Ultherapy PRIME mostly works deeper, in the superficial fat, the fibrous septa, and the SMAS. Sofwave therefore suits fine lines, rough texture, and loss of firmness. Ultherapy PRIME suits sagging of the jawline and cheeks. The two complement each other, and together they tighten the face from the deep layers up to the surface.

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