What causes neck lines and loose neck skin?

The skin on your neck is thinner than facial skin and has fewer oil glands, so it shows aging early. Collagen and elastin decline from your late 20s, and sun damage builds up because the neck is often missed when applying sunscreen. Horizontal lines, sometimes called necklace lines, can appear even in your 20s because of genetics and the natural folds of the neck. Looking down at phones and laptops deepens them. Weight changes and loss of muscle tone add looseness under the chin. Hormonal changes around menopause can also thin the skin, and crepey neck skin often appears together with sun damage on the chest.

How neck concerns are assessed

At Dernia Clinic Myeongdong, your doctor examines your neck at rest, with your chin raised and while you tense the neck muscles. Concerns usually fall into these groups:

Horizontal lines: creases that circle the neck
Crepey skin: thin, finely wrinkled texture, often with sun damage
Laxity: loose skin under the chin and along the neck
Vertical bands: cords from the platysma muscle that show when you tense

Fat under the chin is a separate issue, covered on our double chin page. Your doctor also checks skin thickness and any sun spots, as these affect which device and energy level suit you.

Treatment options for the neck

Ulthera Prime

Ulthera Prime uses microfocused ultrasound with real-time imaging to heat the deeper support layer. It is FDA-cleared to lift skin on the neck and under the chin. Imaging lets your doctor see the tissue layers and place energy at the right depth. Your doctor chooses it when loose skin and early sagging are the main concern and you want a single session. Results build over two to three months and commonly last around a year or longer.

Thermage FLX

Thermage FLX heats the deep dermis with monopolar radiofrequency to tighten skin and stimulate collagen. Your doctor chooses it when neck skin is thin and crepey, often as part of a face, jawline and neck plan; a larger shot plan, often 900 shots, covers all three. Results build over two to six months and often last 12–18 months.

Comparing your options

Treatment	Best when	Downtime	From price
Ulthera Prime (Ultherapy)	Loose skin under the chin and neck	None to mild swelling or tenderness	₩390,000 (100 lines)
Thermage FLX	Neck skin is thin and crepey	None to minimal (mild redness)	₩990,000 (300 shots, face)

Prices are in Korean won (KRW), exclude 10% VAT, and are confirmed at your consultation. You can compare every treatment on our price list.

Combination plans

Ulthera and Thermage are often combined because they work at different depths: ultrasound lifts the deeper layer, while RF tightens the skin. Read combining Thermage and Ulthera for how this works. For horizontal creases, your doctor may add a skin booster to improve hydration and texture; see our neck treatment options. Vertical muscle bands can sometimes be softened with small doses of Botox. Our Seoul Signature Lifting package pairs both devices in one visit.

At-home care and prevention

Apply sunscreen to your neck and chest every day, not just your face.
Take your face serums and moisturizer down onto the neck.
Raise screens to eye level to reduce constant downward folding.
Introduce a retinoid slowly, as neck skin is easily irritated.
Keep your weight stable to protect skin elasticity.

Planning treatment during a trip to Seoul

Ulthera Prime and Thermage FLX are single sessions with little or no downtime. You may feel mild tenderness or see slight redness for a day, and you can usually fly the next day. Skip saunas and very hot baths for the first day. Because collagen builds over months, the full change appears after you are home. Book a consultation to plan a session that fits your itinerary.

Safety and when to see a doctor

RF devices such as Thermage are not suitable if you have a pacemaker or another implanted electronic device, and lifting treatments are postponed during pregnancy. Your doctor adjusts energy for thin neck skin to keep treatment comfortable and safe. A new lump in the neck, swelling around the thyroid, or a mole on the neck that changes should be checked by a doctor before any cosmetic treatment. See who should avoid or delay lifting treatments.

Can neck lines be removed completely?

Deep horizontal lines usually soften rather than disappear. Combining tightening with skin boosters gives the most visible improvement, and early treatment tends to respond best.

Is Ulthera or Thermage better for the neck?

Ulthera Prime lifts the deeper layer and suits loose skin under the chin, while Thermage FLX tightens thin, crepey skin. Many people benefit from both, which is why they are often combined.

Does neck tightening hurt?

You will feel pulses of heat or deep warmth. Numbing cream and energy adjustments keep it tolerable, and some spots feel more intense than others.

At what age do neck lines appear?

Horizontal lines can appear in your 20s because of genetics and posture. Loose skin is more common from the late 30s onward.

How long do neck results last?

Ulthera Prime results commonly last around a year or longer and Thermage FLX about 12–18 months. See how long Ulthera lasts.

Treatments and prices

Ulthera Prime — lifts the neck and under-chin
Thermage FLX — tightens crepey neck skin
Ulthera Prime price — lines and areas
Thermage FLX price — shot plans including the neck

Results and comparisons

Ulthera Prime results — timeline and longevity
Thermage FLX results — how collagen builds
Thermage FLX vs Ulthera Prime — which suits your neck

Related concerns and areas

Crepey, thinning skin — texture on the neck and chest
Sagging skin — laxity on the face
Neck treatments — all options for the neck

Dernia Clinic Myeongdong

Neck Lines and Loose Neck Skin Treatment in Seoul