HIFU facial: results, risks and how long it lasts

How many sessions, and how long it lasts

The figures above come from studies of a single session ^[2][4]. Some redness may show at once, but the real result builds over two to three months as new collagen forms.

How long it lasts is less clear than many websites suggest. The improvement appears to hold for up to a year, and longer-term data are not available ^[2]. The meta-analysis also noted that most studies did not report long follow-up ^[1]. Ageing continues meanwhile, so any treatment slows the clock rather than stopping it. Whether and when to repeat is a decision for your doctor, based on how your face responded the first time.

What the treatment feels like

The session itself involves cleaning the skin, applying a gel and moving the handpiece across the face in lines. Each pulse feels like a deep, prickly burst of heat, strongest over bone.

Discomfort is the usual complaint. In the meta-analysis, the average pain score was 4.2 out of 10 ^[1], and the systematic review described treatment as moderately painful ^[2]. Afterwards, redness and swelling are usual and short-lived ^[1].

Risks, and who it is not for

In published studies, side effects beyond redness, swelling and pain are uncommon. One systematic review put them at around 2%, including temporary numbness or oversensitivity, bruising, burns along the jawline, raised lines on the skin and contact dermatitis ^[2].

Serious complications are rare but possible. A case series described blistering, ulceration, fat loss under the skin and skin necrosis after single sessions, and the authors warned that such events are probably under-reported ^[6]. A 2025 review found only one case of fat loss in the scientific literature. In incident reports to the United States device regulator, however, the problems reported most often were loss of facial fat, nerve injury with numbness or drooping, and scarring ^[7]. These reports are unverified, but they show why energy, depth and technique matter.

Loss of fat is a real concern, because it can make a thin face look more hollow. Nerve injury can cause numbness or weakness, for example an uneven smile. Both are reasons to be treated by someone who knows facial anatomy and adjusts the plan to your face.

HIFU is generally not recommended:

• in pregnancy or while breastfeeding;
• over open wounds, active acne, infection or a cold sore in the area;
• over metal implants, a pacemaker or other implanted devices near the treatment area;
• if you have a very thin face where losing fat would show;
• if you expect a surgical result.

HIFU versus surgery and other options

Surgery. A facelift or neck lift repositions the deeper tissue and removes excess skin. Changes are measured in centimetres rather than millimetres. For marked sagging, surgery remains the option that matches the problem.

Radiofrequency. Radiofrequency also heats tissue to stimulate collagen, using a different form of energy. In a small trial treating one side of the face with each, both improved laxity and there was no significant difference at six months ^[5].

Threads. Absorbable threads give a mechanical lift and stimulate collagen around them. They can lift more than ultrasound, but involve needles, more swelling and their own risks.

Fillers and collagen stimulators. Hyaluronic acid filler replaces lost volume in the cheeks, temples and jawline, which often lifts the lower face more than tightening alone. Collagen stimulators improve skin firmness gradually; we explain them in our guide to collagen stimulators. For an overview of how these combine, read our article on the non-surgical facelift.

In practice, natural-looking results often come from combining treatments, each doing one job.

How we approach it at Rejuvelook

At our clinic in Fuengirola, a doctor sees you for a consultation and looks at your face as a whole: laxity, volume, skin quality and how they relate. We then explain which option suits your face and what change is realistic. Depending on what we find, that may be an energy-based device, threads, collagen stimulators or fillers, alone or combined. If what you need is surgery, we will tell you. We see patients in English or Spanish.

You can read more about our approach to facial rejuvenation.