HIFU (High-Intensity Focused Ultrasound)

HIFU (High-Intensity Focused Ultrasound) is a non-surgical skin-tightening treatment that uses tightly focused sound waves to lift and firm loose or sagging skin.

During the procedure, a handheld device delivers concentrated ultrasound energy deep into the skin's support layers — including the SMAS (superficiomusculoaponeurotic system, the same deep tissue layer that surgeons tighten during a facelift). This energy creates tiny points of controlled heat. The body responds by producing new collagen (the protein that keeps skin firm and elastic). Over the following weeks and months, this fresh collagen gradually tightens and lifts the treated area.

HIFU in dermatology is used for non-surgical skin lifting and contouring. It is most effective for adults who are beginning to notice skin laxity (looseness) but are not yet ready for, or do not want, surgical intervention.

• Sagging or loose skin on the face, particularly around the brows, cheeks, jawline, and chin
• Skin laxity on the neck, sometimes called 'tech neck' or early jowling
• Fine lines and wrinkles on the décolletage (upper chest and neckline)
• Mild to moderate skin looseness on the upper arms, abdomen, or thighs
• Patients seeking a gradual, natural-looking improvement without surgery or significant downtime

HIFU may not be suitable for everyone. A dermatologist will assess whether it is the right option based on several factors.

• Severe skin laxity that is better addressed by surgical lifting
• Active skin infections, open wounds, or inflammatory skin conditions (such as active acne or eczema) in the treatment area
• Metallic implants, pacemakers (heart rhythm devices), or other electronic implants near the treatment site
• Pregnancy
• A history of keloid scarring (thick, raised scars that overgrow the wound) in the treatment area
• Certain connective tissue disorders affecting collagen

HIFU is generally considered a low-risk procedure for most healthy adults, but some side effects can occur.

• Redness and flushing of the treated skin immediately after the session — this usually fades within a few hours
• Mild swelling (puffiness) in the treated area, typically resolving within a day or two
• Tenderness or aching under the skin during and after treatment, particularly over bony areas such as the cheekbones or jawline
• Temporary tingling or numbness in the treated area
• Small bruises (areas of broken blood vessels under the skin) at the treatment points
• In rare cases, temporary nerve irritation causing a brief period of altered sensation or weakness in the nearby muscles
• Superficial burns or blistering if the device is not used correctly — this risk is reduced when the procedure is performed by an experienced, trained provider
• Uneven results or insufficient lifting, which may require additional sessions

Preparation for HIFU is straightforward compared with surgical procedures. However, there are several important steps to follow in the days leading up to the appointment.

In the days before the session, doctors usually advise patients to avoid prolonged sun exposure and not to use tanning beds. Skincare products containing retinoids (vitamin A derivatives that speed up skin cell turnover) or strong exfoliating acids are typically paused for a few days beforehand, as they can make the skin more sensitive. Alcohol and blood-thinning medications or supplements — such as fish oil and certain herbal remedies — may be asked to be avoided for a short period to reduce the chance of bruising. Fasting is not required for this procedure.

A skin assessment is usually carried out before the session. This may include:

• A detailed review of the patient's medical history and any current medications or supplements
• A physical examination of the skin to assess laxity, texture, and any active conditions
• Discussion of the patient's goals and expected results
• In some clinics, photographs are taken to allow comparison after the procedure

On the day of the procedure, the typical steps are as follows:

• The patient arrives with clean skin, free of make-up, creams, and lotions
• The treatment area is cleansed by the practitioner
• A topical anaesthetic (numbing cream applied to the skin surface) may be applied and left for a set period to reduce discomfort — not all clinics use this step
• An ultrasound gel is spread over the skin to help the device glide smoothly and conduct the sound waves
• The HIFU handpiece is placed against the skin; the practitioner moves it systematically across the mapped treatment area
• The device delivers focused ultrasound pulses; the patient may feel warmth, tingling, or brief sharp sensations as each pulse is delivered, particularly over bony areas
• Once the planned area is fully treated, the gel is removed and the skin may be soothed with a cooling product
• The total session time varies depending on the size of the area being treated

HIFU requires little downtime, and most patients return to their normal daily activities on the same day. However, some care in the days and weeks that follow helps protect the skin and support the best possible outcome.

• Some redness, mild swelling, or tenderness is normal in the first day or two; these usually settle without treatment
• Avoid intense heat sources — such as saunas, steam rooms, and hot showers — for at least the first day or two after the procedure, as the skin is more sensitive immediately after treatment
• Apply a broad-spectrum sunscreen (a sunscreen that blocks both UVA and UVB rays) consistently, and minimise unprotected sun exposure while the skin is healing
• Gentle, fragrance-free moisturisers are usually recommended; harsh exfoliants, retinoids, or active acids should be reintroduced gradually and only when the skin is no longer sensitive — the treating doctor will advise on timing
• Strenuous exercise that causes heavy sweating may be advised against for a short period, as sweat can irritate freshly treated skin
• Bruising, if it occurs, typically fades over one to two weeks; arnica gel (a herbal topical sometimes used to reduce bruising) may be suggested by the practitioner
• The final results of HIFU appear gradually, usually over two to six months, as the body builds new collagen — visible improvement may continue to develop during this time
• A follow-up appointment is usually scheduled to assess results; additional sessions may be recommended depending on the individual's skin response
• Results are not permanent; the skin continues to age naturally, and maintenance sessions are typically considered every one to two years, depending on individual skin ageing and the doctor's assessment