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Medically reviewed by Dr Sin Yong · Last reviewed · 20 min read · Doctor-performed, never delegated · Jump to questions
Dr Sin Yong · MBBS (NUS) · MRCS (Edin) · MSc Aesthetic Medicine with Distinction (Queen Mary, London) · MSc Practical Dermatology (Cardiff) · International KOL
Monopolar radiofrequency skin tightening — Thermage FLX® delivers bulk heating to the dermis, directed at collagen remodelling. Non-invasive. No surgery. Supported by two decades of published clinical literature.
Thermage FLX is a monopolar radiofrequency treatment that heats the deep dermis and fibrous septae at 6.78 MHz, with cryogen cooling of the surface, to prompt collagen remodelling. In Singapore it is used for mild to moderate laxity of the face, eyelids, neck and body. It does not add volume, reduce fat or remove excess skin.
Also called: monopolar radiofrequency tightening, 热玛吉, サーマクール
Thermage FLX is a non-invasive monopolar radiofrequency device that delivers controlled thermal energy deep into the dermis and subdermal layers. The heat is directed at collagen contraction and stimulates new collagen production over the following months, acting on skin tightness and texture.
Thermage treats the skin with a single device tip, covering large areas. The FLX (Flex) generation introduced vibration and cooling for comfort, along with a treatment accelerator and AccuREP energy tuning. It is FDA-cleared for non-invasive treatment of the face, eyes and body.
Thermage works through a single thermal mechanism — deep dermal heating. While effective for mild to moderate skin laxity, it does not address facial volume loss, excess fat distribution, or the other dimensions of facial ageing that other protocols are directed at.

Related: Time Freeze Laser LCLR® vs Ultherapy, Thermage and liposuction — what each does, what it cannot do, and why Dr Sin Yong chooses VF Lift for lean faces and Time Freeze for puffy ones.
Thermage delivers monopolar radiofrequency energy that penetrates into the deep dermis and subcutaneous layer. The electrical current generates heat as it passes through tissue, reaching temperatures that cause collagen fibres to contract and new collagen formation to be triggered.
The thermal injury stimulates fibroblast activity and new collagen synthesis over the months following treatment. This gradual remodelling process is what the skin tightening and lifting action depends on — the response builds progressively after treatment rather than appearing at once.
The Thermage FLX handpiece incorporates vibration sensation and surface cooling delivered before, during and after each pulse. This minimises discomfort while allowing effective deep heating. Most patients tolerate treatment well without the need for local anaesthesia.
The most commonly treated area. Thermage addresses mild to moderate skin laxity across the cheeks, jowls and jawline. The Face Tip covers the full face, delivering hundreds of pulses across the treatment zone for uniform coverage.
The dedicated Eye Tip (approved for use around the eyes) addresses hooded upper lids and lower eyelid laxity. The Eye Tip carries a specific ophthalmic clearance, making it an option for periorbital tightening.
Thermage can treat platysmal laxity in the neck and skin quality in the décolletage. Where neck laxity involves the deeper planes or the cervicomental angle, Time Freeze Laser LCLR® or VF Lift work through different mechanisms directed at those planes.
Thermage Body is used for loose skin on the abdomen (post-pregnancy or post-weight loss), inner arms and thighs. Where fat rather than skin laxity is the concern, 4K Body Lift or Time Freeze Laser LCLR® body protocols work through different mechanisms directed at fat.
Thermage works via a single mechanism — monopolar RF heat — to stimulate collagen in the dermis. It does not address fat distribution, volume loss, skin quality beyond tightening, or the multi-dimensional facial changes that occur with ageing. Where the assessment finds change in the deeper planes, fat distribution or volume, Dr Sin Yong may recommend VF Lift or Time Freeze Laser LCLR® — protocols that work through different mechanisms, on different tissue targets and timelines, within one plan.
Thermage is a well-established treatment directed at the skin envelope. Where the assessment finds change in other tissue layers, Dr Sin Yong may plan one of his protocols alongside — or in place of — Thermage, because they work through different mechanisms on different dimensions of facial ageing.
Where Thermage uses a single RF heat mechanism for skin tightening, Time Freeze Laser LCLR® combines dual-wavelength laser energy — calibrated zone-by-zone in real time — to address lifting, lipo-modelling and skin integrity improvement simultaneously. It is directed at the same laxity concerns through a different mechanism — laser rather than radiofrequency — and adds an LCLR lipo-modelling action, which is a separate mechanism from dermal heating.
The VF Lift is Dr Sin Yong’s customised non-surgical facelift protocol on Volnewmer monopolar radiofrequency, applied along vertical vectors and calibrated per zone. Where Thermage delivers uniform dermal heating, the VF Lift is directed at three distinct targets: laxity and jowling, excess facial puffiness, and hollow cheeks through adipose stem cell and collagen stimulation — a different set of mechanisms from dermal heating alone.
Thermage remains a strong clinical option and is offered at the clinic. Dr Sin Yong will recommend the most appropriate protocol — or combination — at your consultation based on your specific anatomy, degree of laxity and goals.
Fees for Thermage are not published on this site, but what decides the cost can be set out. The largest factor is the treatment tip and the number of pulses the plan uses: Thermage FLX tips are single-use, and the face, eye and body tips differ in size and in the pulses they carry, so a full face, an eyelid treatment and a body area are different undertakings.
The second factor is the area, and how many areas are combined in one visit, for example face and eyes, or face and neck. The third is what the assessment finds: where laxity sits alongside fat or volume change, a plan may combine Thermage with another protocol, or point to a different one, which changes the cost. Fourth is whether a review or maintenance treatment is anticipated, since collagen remodelling continues for months and any repeat is planned at review rather than on a fixed schedule. When comparing quotes, it helps to confirm that the device is Thermage FLX and which tip and pulse count are included, because radiofrequency tightening covers many different devices. The fee is set out clearly at consultation, after Dr Sin Yong has assessed you.
Thermage eye treatment uses a dedicated Eye Tip, smaller than the face tip, that is cleared for use on the upper and lower eyelids and the skin around the eyes. It heats the thin periorbital skin to prompt collagen remodelling, and is directed at mild hooding of the upper lid, crepey lower-lid skin and fine lines around the eyes.
Because the eyelids sit directly over the eye, the manufacturer's protocol uses protective eye shields, placed after anaesthetic eye drops, and energy is set for thin skin. Redness and mild swelling of the lids afterwards are common and settle. What the Eye Tip does not do matters as much. It does not remove herniated fat behind an eye bag, fill a tear trough hollow, or correct a drooping lid caused by a weak lifting muscle (ptosis), and marked excess upper-lid skin is more predictably addressed by eyelid surgery, for which patients are referred to a plastic surgery or oculoplastic specialist. Hooding caused by a descended brow is a brow question rather than an eyelid one. Assessment separates these before the Eye Tip is considered.
| Option | What it does | What it cannot do | Typical recovery | Who it tends to suit |
|---|---|---|---|---|
| Thermage FLX (Solta Medical monopolar radiofrequency) | Bulk heating of the dermis and fibrous septae at 6.78 MHz, with cryogen cooling and AccuREP energy tuning | Does not place focal heat in the SMAS, add volume or reduce fat | Usually transient redness and warmth; occasional swelling | Mild to moderate laxity of the face, eyelids (Eye Tip), neck and body |
| VF Lift – Vertical Facelift (Volnewmer monopolar radiofrequency) | Dr Sin Yong's customised monopolar radiofrequency protocol, applied along vertical vectors and calibrated per zone, directed at laxity, puffiness and hollowing | Does not use focused ultrasound or remove redundant skin | Usually transient redness and warmth | Laxity with puffiness or hollowing, on the face or body |
| HIFU (Ultraformer MPT) | Heats focal points in the SMAS and dermis at set depths | Does not reduce a full fat pad, restore volume or remove skin | Mild redness, warmth or tenderness; occasional swelling or bruising | Early to moderate laxity along the jawline, under the chin and across the neck |
| Time Freeze Laser LCLR® | A dual-wavelength laser protocol directed at lifting, lipo-modelling of compact fat and skin integrity | Does not replace volume in a hollow face or remove redundant skin | Varies with the zones treated and is explained at assessment | Laxity with compact fat in the jowl, submental or body zones |
| Thread lift (Bliss Lift) | Repositions tissue mechanically with absorbable threads | Does not improve skin quality or remove skin | Swelling, tenderness or bruising along the thread paths | Moderate descent where repositioning is the aim |
| Surgical facelift or eyelid surgery (referred to a plastic surgery specialist) | Removes redundant skin and repositions deeper tissue surgically | Is not a non-surgical option, and does not change skin quality on its own | A formal surgical recovery set by the operating team | Marked laxity or redundant eyelid skin beyond what energy devices reach |
Thermage FLX is not used in anyone with a cardiac pacemaker, implantable defibrillator or other implanted electronic device, because monopolar radiofrequency passes an electrical current through the body to a return pad. It is postponed during pregnancy, where its safety has not been established, and over skin that is infected, broken or inflamed, including an active cold sore or a flare of eczema in the treatment area.
Other points change the plan rather than rule treatment out: metal implants or plates near the area, recent filler or threads where the tip will pass, a skin condition that flares with heat, slow wound healing, and reduced sensation in the area, since energy is chosen partly from what you feel during each pulse. For the Eye Tip, contact lenses are removed and the eye is shielded. A face whose main problem is lost volume, heavy fat or marked loose skin is better served by a different approach, as set out above. Suitability is decided at consultation, after Dr Sin Yong has taken a medical history and examined the area.
No energy treatment is free of risk, and Thermage FLX is no exception. The common effects are redness, warmth, mild swelling and tenderness, which usually settle within hours to days; the eyelids can stay puffy for longer after Eye Tip treatment. Less often there may be small raised welts, bruising, or temporary numbness or altered sensation.
The rare risks are a superficial burn or blister, crusting, and, where too much heat reaches one spot, a dip in the contour from injury to the fat beneath the skin. Technique has changed because of this: a 2007 survey of 5,700 facial treatments compared the original high-energy, single-pass method with lower-energy multiple passes guided by the patient's report of heat, and the panel recommended energy selection based on that feedback. Risk is reduced by a medical assessment beforehand, a genuine single-use Thermage FLX tip, cryogen cooling, energy chosen with your feedback during each pass, and clear aftercare. Any blistering, lasting redness or change in contour is reviewed by Dr Sin Yong.
The sequence below describes phases, not a timetable: how quickly each passes depends on the settings used, the area and the person, and is discussed at consultation.
People whose main concern is lost volume, heavy fat or marked loose skin tend to respond poorly, because deep dermal heating is the wrong tool for those problems.
It heats the skin envelope to prompt collagen remodelling; it does not reposition deeper tissue, add volume or remove excess skin.
Technique has moved towards lower energy in multiple passes guided by your report of heat, and energy is selected that way at the clinic.
Thermage FLX is the fourth-generation platform from Solta Medical, and what changed is how energy is delivered and tuned, not what the energy is. It is still monopolar radiofrequency at 6.78 MHz, still heating the deep dermis and fibrous septae, and still protected at the surface by cryogen cooling before, during and after each pulse. The FLX generation introduced vibration and surface cooling at the handpiece for comfort, a treatment accelerator, and AccuREP energy tuning. AccuREP adjusts energy in real time without imaging, so the energy is guided by your report of heat during each pass.
Two things have not changed. The target remains the skin envelope, meaning dermal collagen and the septae beneath it, rather than the SMAS, which is the plane reached by focused ultrasound. And Thermage still does not add volume, reduce fat or remove excess skin. Technique has also moved on. A 2007 survey of facial treatments compared the original high-energy single pass with lower-energy multiple passes guided by the patient's report of heat, and the panel recommended choosing energy from that feedback, which is how energy is selected at the clinic. Treatment uses a single-use tip, and it is worth confirming that a genuine FLX tip is used when comparing clinics.
Thermage and Volnewmer are both monopolar radiofrequency at 6.78 MHz, which heats a volume of tissue. HIFU is focused ultrasound, which heats discrete points at set depths, including the SMAS. Dr Sin Yong uses all three categories: Thermage FLX, Volnewmer as the platform behind VF Lift – Vertical Facelift, and the Ultraformer MPT for HIFU. They are not rivals for the same job, so which suits a face depends on whether the examination finds laxity in the deeper support layer, in the skin itself, or a volume deficit that heating cannot refill. The article on Thermage, HIFU and Volnewmer sets out the comparison at greater length.
| Option | Energy | Layer reached | Heating pattern | What it cannot do |
|---|---|---|---|---|
| Thermage FLX | Monopolar radiofrequency, 6.78 MHz, cryogen surface cooling | Deep dermis and fibrous septae | Bulk heating through a single-use tip | Add volume, reduce fat or remove excess skin |
| Volnewmer (VF Lift – Vertical Facelift) | Monopolar radiofrequency, 6.78 MHz, active surface cooling | Dermis and subdermal fibrous septa | Bulk heating planned zone by zone along vertical vectors | Refill a hollow or replace surgery for heavy laxity |
| HIFU (Ultraformer MPT) | Focused ultrasound converging at set depths | Chosen by cartridge; the deepest reaches the SMAS | Discrete thermal points, with the tissue between spared | Replace lost volume or reach heavy redundant skin |
Thermage delivers radiofrequency skin tightening in Singapore, smoothing and firming skin across the face and body. As a monopolar radiofrequency skin tightening treatment, it complements other non-surgical lifting protocols.
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“Thermage works through a single thermal mechanism — deep dermal heating.”
Dr Sin YongOn mechanism
A focused zone and a full-face plan are different undertakings, and the fee reflects the extent of what is actually treated.
The plan follows the examination — what is loose, what has descended, and what the skin itself needs determine the approach.
Some plans use one technology; others combine modalities at different depths, staged over time.
Fees are not published on this site; they are set out at consultation. Your fee is set out clearly at consultation, after Dr Sin Yong has assessed you — before anything is decided.
Thermage, VF Lift, Time Freeze Laser LCLR® — the plan comes from matching the mechanism to your specific anatomy, degree of laxity and goals, which is assessed at consultation.
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