Brazilian butt lift safety: the rules that lower the risk

Why has the BBL carried such a high risk?

The danger specific to a BBL is fat embolism. Fat injected into or under the buttock muscle can enter large veins and travel to the heart and lungs. A 2017 survey of 692 surgeons, covering 198,857 BBLs, recorded 32 fatal and 103 non-fatal fat emboli, more often where fat went deep into muscle.

In autopsies after BBL deaths, fat was found in or under the muscle; no death has been reported where fat was found only under the skin. The safety rules that followed all exist to keep fat out of the muscle and away from those veins.

What are the safety rules?

• Fat goes only into the layer under the skin, never into or beneath the muscle. In the UK, BAAPS calls the procedure superficial gluteal lipofilling to stress this.
• Ultrasound during surgery confirms that the cannula tip stays under the skin. BAAPS guidance requires it, and Florida law makes such guidance mandatory.
• A rigid cannula of at least 4 mm, entry points that keep it shallow, no downward angling, and the surgeon's other hand feeling its position.
• Fat injected in many small passes, only while the cannula is moving.
• Staging: if more volume is wanted than fits under the skin, a second session is advised rather than deeper injection.
• A personal clot-risk assessment, and limits on combining a BBL with other operations.

Has the risk actually fallen?

Estimates suggest it has, but the picture is not settled, and most of the evidence comes from surveys, case series and forensic reports rather than controlled trials.

Ultrasound-guided series of 6,235 patients reported no deaths or fat embolism, but that evidence is uncontrolled. The rules lower the risk; they do not remove it.

What else raises the risk?

The 2025 Istanbul study named higher BMI, several operations at once and buttock fat transfer as major risk factors, and 85.7% of the people who died had several operations in one session.

Blood clots are the other serious concern. Body procedures carry a much higher clot risk than face or breast surgery, and long sitting, including on a flight, adds to it. So does combining a BBL with other operations, such as a tummy tuck.

What other complications can happen?

• Fat loss and asymmetry: on average 60–80% of the transferred fat survives, and the two sides can differ. A further session is sometimes needed.
• Seroma and contour irregularity: in the meta-analysis of 22,151 patients, seroma occurred in 2.03% and contour irregularity in 2.29%.
• Infection: reported in 2.0% in an earlier review.
• Fat necrosis and nerve symptoms: some grafted fat can die and form firm lumps, and pain, including sciatic-type pain, or changes in sensation can occur and may persist.

Ask Dr. İlker a question

Does it matter where and by whom it is done?

It does. The rise in deaths after 2019 was concentrated in high-volume, low-cost clinics. Florida law requires the surgeon to examine the patient face to face at least the day before surgery, a useful benchmark wherever you have it done.

Op. Dr. Bilgehan İlker, a specialist in plastic, reconstructive and aesthetic surgery, examines donor areas, skin and buttock shape in person before any plan is agreed. She treats fat transfer as surgery, never as an office procedure.

Is a non-surgical BBL with fillers a lower-risk option?

No. BAAPS has reported sepsis, tissue death, infection and scarring after filler injections into the buttocks, and in 2025 the UK government announced that non-surgical BBLs will be restricted to qualified healthcare professionals in registered settings. It is not a lower-risk version of surgery.

What should I ask any clinic before deciding?

• Will the fat be placed only under the skin, and how will you confirm the cannula's position during surgery?
• Will ultrasound guidance be used throughout the injection?
• How much fat do you plan to transfer to each side, and what happens if I want more?
• Who will perform the liposuction and the fat injection?
• Which hospital, and how long will I be monitored?
• How will my clot risk be assessed and reduced?

How do buttock implants compare?

Buttock implants avoid the fat-embolism risk linked to a BBL, but they carry more complications overall: in a 2016 review, about 22% of implant patients had one, against about 10% after fat grafting. Wound breakdown was the most common problem, affecting about 1 in 10.

How does recovery affect the risk?

With a BBL, the limit on travel is sitting rather than the wounds. ASPS advises avoiding long sitting for about two weeks, and a flight means hours in a seat, which raises clot risk and may harm the grafted fat. There is no official day count, so your surgeon sets your flight date at a check-up.

In the first days, stand and walk regularly, sit only when you must with a cushion under the backs of your thighs, and sleep face down or on your side. On long trips, stand and move every hour.