HIFU Singapore (超声刀), a Doctor’s Guide to HIFU Treatment

Ultrasound is sound at a frequency too high to hear. At the low intensity used in a pregnancy scan, it passes through tissue without heating it. When the beam is focused to a single point, in the way a magnifying glass focuses sunlight, the energy converges there and heats a spot of tissue roughly the size of a sesame seed to above 60°C, the temperature at which collagen contracts. A HIFU treatment places hundreds of these points in lines at selected depths, and because the energy converges only at the focal point, the skin surface above it is not heated.

Each heated point produces two effects. The collagen fibres at that point contract immediately, which accounts for the slight lift some patients notice on the day of treatment. Over the following weeks, the body repairs each point with new collagen, and this remodelling produces the lasting result. In the first Asian study, skin samples taken from Korean patients before and two months after a single treatment showed more collagen and firmer elastic fibres in the treated skin [2].

Depth distinguishes HIFU from other non-surgical tightening treatments. Radiofrequency devices such as Thermage and Oligio heat a broad volume of tissue just beneath the skin surface. At 4.5 mm, HIFU reaches the superficial musculoaponeurotic system, the thin, tough support layer over the facial muscles that a surgeon tightens during a facelift. HIFU is therefore the better choice when the face has dropped, whereas radiofrequency is better suited to skin that has loosened without descending.

HIFU suits a face that has begun to sag but retains good skin quality. The typical patient is between the late thirties and the late fifties, presents with early jowls, a softening jawline, a descending cheek, a mild double chin or a loss of definition in the neck, and wants a lift without an operation, a scar or time off work. If your jawline has softened or your cheeks have started to drop, but your skin is still in good condition, you are likely to be a good candidate.

I decline HIFU for three types of face, and in each case the published research supports the decision.

• A face with marked volume loss. Deep HIFU reduces fat as well as tightening tissue, so a thin or deflated face loses further volume and appears gaunt rather than lifted. A Korean study on an earlier machine from the manufacturer of Tightan 2 reported that deep ultrasound “can also cause significant fat atrophy, limiting its use in patients with a lean face” [11].
• A face with extensive acne scarring. Acne scars lie in the upper skin, which HIFU deliberately spares, so lifting the tissue beneath them does not improve their appearance. That face needs scar treatment first.
• A face with advanced sagging or a heavy face. The response falls away with both in the published studies [3, 7]. In the largest trial, more than half of the patients with a body mass index (BMI) over 30 showed no change at all, compared with about one in eight of the other patients [3]. A few millimetres of tissue contraction cannot support the weight of heavy jowls or a fully descended neck, and those faces are better assessed for threads or surgery.

HIFU is not performed during pregnancy, over metal implants in the treated area, over an active skin infection, or on skin with open spots or severe acne. Where texture, pores or acne scars are the main concern, RF microneedling or another skin treatment is assessed instead. RF microneedling acts on the upper skin, where texture and scarring lie, whereas HIFU acts on the deeper support layer, so the two are not interchangeable even though both stimulate collagen.

HIFU on Asian skin and the risk of pigmentation

Laser light is absorbed by melanin, which is the source of the pigmentation risk that lasers carry on darker skin. Ultrasound is not absorbed by melanin, and HIFU leaves the skin surface unheated, so that risk does not apply in the same way. A trial of 52 people with skin types III to VI on the Fitzpatrick scale, from light brown to deeply pigmented skin and covering most Singaporeans, recorded three temporary side effects, all resolved by three months [13]. The first Asian study, in Korean patients, found improvement in every patient and no lasting side effects [2].

HIFU for patients in their twenties, sixties and seventies

Patients at both ends of the age range request HIFU, and in my practice I usually recommend the gentle machine for both. In the twenties the skin is not sagging, and deep treatment risks fat loss in a face with none to spare. Sygmalift firms the skin and, on its fat reduction setting, sharpens the jawline and chin, which is usually the aim at that age. In the sixties and seventies the loosening is more advanced. Deep HIFU achieves little lift on an advanced sag, is less comfortable, and does not treat the upper layer of the skin, where an older face shows most of its ageing. Sygmalift is mild, comfortable and treats that upper layer. The result is gentler, but for these two groups a gentle result that can be tolerated and repeated is the better balance.

A HIFU face lift works for a suitable face, and the research quantifies the effect. The first controlled study, published in 2010, treated 35 people across the whole face and neck, and three doctors who were blinded to the treatment rated the photographs. At three months, 30 of the 35 showed a visible brow lift, averaging just under two millimetres [1]. The largest single trial, of 93 people treated on the lower face, found improvement in about six in ten patients by blinded assessment and in two in three by the patients’ own rating [3]. Pooled across studies, roughly three in four suitable patients improve at three months, and about seven in ten remain improved at six months [5]. A 2025 pooled analysis put improvement closer to nine in ten, although its authors cautioned that the figure may be overstated [6].

Two limitations in the same studies are as important as the positive findings. The lift is measured in millimetres, and one review describes the improvement as mild [7], so HIFU produces a visible change but not the result of a surgical facelift. Results also diminish as sagging advances and as body weight increases, most clearly in patients with a BMI over 30 [3].

HIFU results in my practice

The published figures are consistent with my own results. Most suitable patients improve, and those who do not are the patients the studies predicted, with a heavy face or an advanced sag, neither of whom I treat with HIFU. The complaint I hear most often from patients treated elsewhere is not a burn or hollowing but that HIFU produced no result at all. On examination and on review of what was done, the cause is usually too few shots, shots placed in the wrong area or a machine that never reached the support layer, as described in the next two sections.

Four questions identify the treatment before booking. The first is which machine will be used, by name. The second is which depths it treats, and whether the deep 4.5 mm layer is included. The third is whether a doctor or a therapist will perform the treatment. The fourth is whether the price covers the whole face in one session at a fixed cost, or is a trial that is later converted into a package. A clinic that answers all four clearly is offering a defined treatment, whereas a clinic that answers with a shot count alone is offering a number that says nothing about depth or placement.

HIFU shot counts, and why I do not advertise one

I do not advertise a shot count, because the number of shots I use is customised to each face. Some clinics charge less because they deliver very few shots. A very low full-face price usually means too few shots or a single depth, and a smaller result. Other clinics deliver enough shots but place them poorly, with hundreds across a cheek that cannot afford the fat loss and too few along the jawline that needed lifting. Neither problem is visible in the advertised number. The result depends on a treatment planned to the patient’s anatomy, with the correct depth and number of lines for each area of the face.

The treatment decision is made at the consultation. I assess how far the face has descended and how much of the change lies in the skin, the fat and the support layer, decide which layers to treat and which to leave alone, and mark the treatment lines on the face rather than following a fixed grid. A small 2026 study of women over 60 compared standard HIFU with treatment planned to each woman’s own tissue thickness measured on ultrasound, and the individually planned group achieved better results [16]. Photographs are taken at the consultation for comparison at the review.

On the day of treatment, numbing cream is applied for 20 to 30 minutes. A cold ultrasound gel is then spread over the skin, and the handpiece is moved across each area in passes. Each pass produces a brief, deep prickle of warmth, strongest over the jawbone and brow, where the energy lands close to the bone, and mildest over the cheek, where more soft tissue lies above the bone. The deep layer is treated first, then the collagen layer, then the eyes and jawline with the pen handpiece. The full face takes 60 to 90 minutes on the deep machine and about an hour on the gentle one. No marks are left on the face, and patients can return to work immediately.

Having had HIFU myself, I can describe the sensation. Each shot can sting briefly, and the discomfort ends when the pass ends. The studies put pain at about 3 to 6 out of 10 [3, 5, 6], and in the pooled studies no patient was unable to complete treatment [5]. Numbing cream is used for the deep treatment, whereas the gentle treatment requires none.

HIFU pain and comfort in my practice

Tightan 2 is considerably more comfortable than the Ultherapy systems I used for years before it. The pain of deep HIFU depends more on the energy settings and the operator than on the brand of machine, and pushing through severe discomfort gains nothing. Effective settings are those that the patient can tolerate for the full treatment.

HIFU by a doctor or a therapist, and why the difference matters

HIFU is offered in Singapore by both doctors and therapists. The difference lies less in the machine than in the treatment plan. A doctor decides, line by line, which depth each area of the face requires, knows where the facial nerves and vessels run, and can identify when HIFU is the wrong treatment for a particular face. The safety research supports this. Surface burns occurred where technique was poor [9], and the trial in darker skin concluded that the treatment is safe “when performed by trained physicians” after every side effect was traced to technique [13]. Technique matters more with a deep machine than with a gentle one, and every HIFU treatment at the clinic, deep or gentle, is performed by me.

How HIFU compares with Ultherapy

Ultherapy is a brand of HIFU, the original focused ultrasound lifting machine, working in the same way at the same depths, and the machine on which most of the research in this guide was conducted [1, 3, 4, 6]. I used it for years. It differs from Tightan 2 in engineering and in its on-screen ultrasound image, not in its effect on the tissue. Ultherapy is not offered at the clinic, and I have written separately about where it is worth having. For most faces the result depends more on the treatment plan than on the machine, as the HIFU vs Ultherapy page explains in detail.

Where Thermage radiofrequency fits alongside HIFU

HIFU lifts, whereas Thermage tightens. HIFU reaches the support layer over the muscle and is the better choice when the face has dropped. Thermage uses radiofrequency to heat the whole collagen layer and is the better choice when the skin itself has loosened, particularly thin skin, and for the eyelids. The only randomised trial comparing the two directly, in 20 people treated on the neck, found no significant difference at six months and found the ultrasound more painful [12], although it was small and confined to the neck. HIFU costs less than Thermage, and many patients in their late forties and fifties have both treatments a few months apart.

Where Oligio sits among the tightening devices

Oligio is a radiofrequency machine from WONTECH, the Korean company that also makes Tightan 2. It acts like Thermage, heating a broad layer to tighten loose skin, whereas HIFU lifts a face that has dropped. A face with both problems is often treated with one device of each type. The Oligio vs HIFU vs Thermage page compares the three.

A suitable HIFU clinic names its machine, states which depths it treats, confirms who will perform the treatment, quotes one fixed price for the area requested, shows photographs of its own patients at the consultation, and is prepared to advise against HIFU when it is the wrong treatment. HIFU reviews and Reddit threads show that results vary widely between clinics, that inexpensive packages often disappoint and that thin faces can become hollow, all of which the research predicts. They do not show that HIFU is ineffective, but that HIFU performed on the wrong face, at the wrong depth or with poor technique fails.