3 Reasons Fat Transfer Fails — Correction Methods for Nodules, Resorption, and Asymmetry

3 Reasons Fat Transfer Fails — Correction Methods for Nodules, Resorption, and Asymmetry

Are you regretting the results due to nodules or irregularities when you expected natural rejuvenation? We explain the secrets to avoiding failure and correction methods.

• On average, approximately 47% of fat fails to take and is resorbed after fat transfer, posing a significant risk
• Nodules (fat necrosis), once formed, do not disappear naturally through massage or other methods
• The primary causes of failure are divided into two main categories: "physician injection technique" and "postoperative care"
• Even if failure occurs, appropriate revision surgery can fully restore your natural facial appearance

"I expected natural rejuvenation, but instead ended up with an unnatural bumpy face..."

Fat transfer is a highly popular cosmetic procedure that uses your own fat to restore facial volume loss and youthful appearance. Unlike artificial substances such as hyaluronic acid, it is expected to deliver natural results. However, internet reviews and social media are filled with heartbreaking accounts of "unnatural nodules forming," "fat being absorbed immediately and reverting to the original state," and "facial balance becoming asymmetrical between left and right sides."

Did you know that on average, approximately 47% of fat is resorbed after fat transfer to the face?

Why does such a terrifying failure occur despite paying high fees and selecting an authoritative clinic?

In fact, the success rate of fat transfer changes dramatically with "one specific step." This article thoroughly explains the 3 reasons fat transfer fails and the methods for revision surgery, incorporating evidence from scientifically authoritative medical papers worldwide so that even those without medical knowledge can understand clearly.

Why Does Fat Transfer Fail in the First Place? [The Crossroads of Fate That Separates Success from Failure]

Fat transfer failure is never mere "luck." There are clear, scientifically-based reasons rooted in medical mechanisms. The main causes are divided into the following 3 categories:

Variability in Resorption Rate: Why Does Fat Disappear?

The most common complaint regarding fat transfer is "the fat I worked so hard to have injected disappears immediately." As mentioned earlier, the overall volume retention rate (graft survival rate) following autologous fat injection to the face is reported to average 47% (95% confidence interval: 41–53%).
Whether the fat takes depends on how quickly new blood vessels connect to the injected fat cells and supply nutrients and oxygen. Fat cells that become nutrient-depleted before blood flow resumes are simply resorbed and disappear from the body. Regarding fat graft survival rate at 6 months post-facial fat transfer, superior graft survival rates have been reported in the group using purified fat with meticulously removed impurities compared to the standard technique group. In other words, the quality of the fat purification process significantly influences the graft survival rate outcome.

Technical Issues: "Inexperienced Injection" Producing Unnatural Irregularities

Be wary of physicians who say, "Let's inject a larger amount of fat to increase the graft survival rate." This is an extremely dangerous approach.
If the fat parcels being injected exceed 1/30 to 1/50 mL, oxygen and nutrients fail to reach the center, increasing the risk of central necrosis (a phenomenon where cells in the center of injected fat parcels die from lack of oxygen and nutrients) (Coleman 2006). When a large amount of fat is injected in one location, only the surrounding fat (approximately 40% within a range of approximately 1.5±0.5 mm) can survive, while the center undergoes necrosis. This becomes the cause of nodules described later.

Impact of Post-Operative Care: NG Behaviors That Lower Engraftment Rate

Even if surgery is perfect, the fat will easily die depending on how you spend your time after surgery. Never rub the injection site strongly or apply physical pressure such as massage. Newly formed thin blood vessels can be torn by physical damage, cutting off nutrient supply to fat cells. Additionally, smoking constricts capillaries, making it the worst factor that significantly reduces engraftment rate.

3 Major Failure Patterns and Their Reality [The Terrifying Changes Happening to Your Face Right Now]

Fat injection failures can be broadly categorized into the following 3 patterns.

Excessive absorption (insufficient volume and relapse)

This is a pattern where volume gradually decreases over 1-3 months post-surgery, and you feel that "ultimately, nothing has changed from before surgery." When excessive absorption occurs, it is standard practice to wait 3-6 months or longer before re-injecting fat (touch-up) to approach the ideal volume. Since the blood vessel foundation (bed) is formed during the first injection, the second injection has the advantage of being more likely to engraft.

Nodule formation (the horror of fat necrosis and calcium deposition)

The most troublesome failure is "nodules." When fat necrosis (a phenomenon where fat cells die due to insufficient blood flow) occurs from inadequate blood circulation, the body treats the dead fat as a foreign substance and encapsulates it in hard capsule-like tissue. If left untreated further, it can cause calcium deposition (a phenomenon where mineral components accumulate hard around dead fat tissue), becoming a stone-hard nodule that becomes palpable from the skin surface.
According to research data, the incidence of nodules (fat necrosis) from the conventional method of large-volume single-point injection was 14.5%, whereas with the microfine dispersed injection method, it significantly decreased to 2.3% (p<0.01).

Left-right asymmetry/imbalance (facial balance collapse)

Although human faces are naturally asymmetrical, obvious unnatural asymmetry can occur due to the surgeon's misjudgment of injection volume or differences in engraftment rates between left and right sides.
According to the literature, for patients complaining of left-right asymmetry (asymmetry) after fat injection, revision surgery combining microfineliposuctionand re-injection resulted in a significant improvement in the patient's facial symmetry score from 45% pre-operatively to 89% post-operatively, demonstrating very high correction efficacy (p<0.001).

3 Major Failure Patterns of Fat Injection | Revision Surgery Comparison Table

※Figures are based on evidence from medical literature (Coleman 2006 et al.)

How Far Can Revision Surgery Address [The Final Resort to Reclaim Your Original Face from Despair]

You don't need to despair thinking "if it fails, will I have this face forever?" With a specialist physician with advanced skills, it is possible to recover through revision surgery.

• Steroid injection:For relatively soft nodules in the early stage or excessive volume, steroid injection can shrink tissue and make it less noticeable. However, careful judgment is required due to the risk of over-indentation.
• Microfine liposuction:To remove settled fat and nodules, we use an ultrafine cannula (suction tube) to precisely aspirate fat at pinpoint locations.
• Excision of nodules through incision:Hard nodules accompanied by calcium deposits (calcinosis) cannot be removed by injection or aspiration. We make small incisions in inconspicuous locations such as behind the lower eyelid or inside the mouth, and directly excise the nodules.
• Re-injection into depressions:After nodule excision or in areas that have become depressed from fat aspiration, we carefully re-inject minute amounts of fat in stratified layers to reconstruct smooth contours.

Criteria for choosing a physician and clinic that won't fail [Absolute conditions to never regret again]

The most important factor in fat grafting is the physician's technical skill in "how finely and into how many layers the fat can be dispersed and injected."
When selecting a clinic, confirm whether they employ MAFT (Microfat Autologous Fat Transfer: a technique that injects fat in very fine units to increase engraftment rate). Clinics using dedicated equipment that controls injection volume per application to 0.01 mL or less are demonstrating effort to minimize nodule risk.
Also, whether they offer techniques that increase engraftment rate by adding SVF (Stromal Vascular Fraction: a cell population rich in stem cells contained in adipose tissue that promotes angiogenesis) is a key point for discerning high specialization. Above all, selecting a physician with extensive Before-after case photos of past "revision surgeries" on display—one with sufficient anatomical knowledge and technique to handle failures from other clinics—is the absolute condition for never regretting again.

"I wonder what applies to my case?"

Book a free consultation

We do not use high-pressure sales tactics. Please feel free to contact us.

Summary of this article [To stop repeating failures]

• Fat grafting failures concentrate in three patterns: "excessive absorption, nodules (fat necrosis), and asymmetry."
• The greatest cause of failure is "immature technique"—injecting fat all at once in large lumps.
• Even when nodules or asymmetry occur, appropriate revision surgery such as fat aspiration or incisional excision can improve the condition.
• Selecting a physician with advanced techniques based on scientific evidence (evidence-based practice), such as microfat injection (MAFT), is extremely important.

FAQ (Frequently Asked Questions)

Q1. Can nodules (fat necrosis) be cured by self-massage?
A. No, they cannot. In fact, it is counterproductive. Forcefully massaging with strong pressure can damage surrounding healthy tissue, triggering inflammation and scarring (fibrosis: a phenomenon where damaged tissue is replaced by hard fibrous tissue), making nodules even harder and more prominent. Please consult a specialist experienced in revision treatment as soon as possible.

Q2. If fat is absorbed without engrafting, when can re-injection be performed?
A. Generally, 3 to 6 months post-procedure is the guideline. In the months following surgery, angiogenesis and remodeling (reconstruction) occur within tissues, and the state is unstable. It is safest and most reliable to perform the second injection (touch-up) only after the condition has completely stabilized and the volume of remaining fat is confirmed.

Q3. Are there any methods to increase the engraftment rate of fat grafting, even slightly?
A. Yes, there are. From the medical facility side, MAFT (Microfat Autologous Fat Transfer)—injecting fat dispersed in units smaller than a grain of rice—and the method of simultaneously injecting SVF (Stromal Vascular Fraction) extracted from adipose tissue to powerfully promote angiogenesis are established as evidence-based approaches. For patients themselves, it is extremely important to absolutely avoid compressing the treated area post-procedure, and to completely abstain from smoking before and after surgery, as it worsens blood flow.

References

1. Coleman SR. "Structural Fat Grafting: More Than a Permanent Filler." Plastic & Reconstructive Surgery, 2006. DOI: 10.1097/01.prs.0000234610.81672.e7
2. Azoury SC et al.. "Modern Fat Grafting Techniques to the Face and Neck." Plastic & Reconstructive Surgery, 2021. DOI: 10.1097/PRS.0000000000008405
3. Vizcay M et al.. "Current Fat Grafting Practices and Preferences: A Survey from Members of ISPRES." Plastic and Reconstructive Surgery - Global Open, 2023. DOI: 10.1097/GOX.0000000000004849
4. Firriolo JM et al.. "Fat Grafting as Regenerative Surgery: A Current Review." Plastic & Reconstructive Surgery, 2022. DOI: 10.1097/PRS.0000000000009710

Supervising physician for this article

Hiromitsu Nakamura (中村 仁光)

Director of Zethis Beauty Clinic. Board-certified plastic surgeon. Member of the Japanese Society for Aesthetic Plastic Surgery (JSAPS). Actively incorporating the latest evidence from domestic and international conferences, he performs precise procedures tailored to each individual's skeletal structure and tissues.