Improving Dark Circles and Hollows with Under-Eye Fat Grafting: The Difference From Eye-Bag (Aegyo-Sal) Creation and How to Choose

Improving Dark Circles and Hollows with Under-Eye Fat Grafting: The Difference From Eye-Bag (Aegyo-Sal) Creation and How to Choose

The under-eye shadows that make people ask "are you tired?" may, in fact, worsen with the wrong care.

• What is the "structural" cause that expensive eye creams will absolutely never solve?
• Eye-bag makeup andHyaluronic acid injection—cases where they backfire, and the dramatic effect of fat grafting
• The decisive difference between "fat grafting" and "eye-bag creation" and the ultimate, regret-free way to choose
• A retention rate of 47%? The real figures and truth about fat grafting revealed by authoritative research data

Shocking! Why is "autologous fat grafting" the most effective for under-eye dark circles and hollows?

Under-eye dark circles and hollows are not caused merely by lack of sleep or poor circulation. In many cases, they arise from a complex interplay of three-dimensional changes in the internal structure of the face. This is exactly why surface-level skincare has its limits.

Looking in the mirror becomes depressing… the cruel mechanism of fat loss and descent due to aging

As you age, the bone structure around the eyes shrinks slightly, and at the same timethe orbital fat (the deep fat that acts as a cushion protecting the eyeball)the membrane and muscle that support it loosen. As a result, gravity pushes the orbital fat forward, producing a conspicuous "bulge" under the eye.

What further worsens the situation is the decrease in the subcutaneous fat of the cheek just below it, and the loosening and descent of theligaments (the supporting tissue that firmly connects bone to skin and muscle). When the bulge (protrusion) and the fat loss beneath it (depression) are adjacent, deep "hollows" or "grooves" form. This strong difference in elevation blocks light, creating dark shadows and giving a tired impression—this is the true nature of "black dark circles."

The peace of mind of zero foreign material! The overwhelming superiority of "autologous fat" that hyaluronic acid lacks

What makes the most sense for eliminating this complex step is treatment that injects autologous fat harvested from your own body. Artificial fillers such as hyaluronic acid are convenient, but under the eye, where the skin is extremely thin, there is a noted risk of causing the "Tyndall effect," appearing bluish-white and unnatural through the skin.

Autologous fat, on the other hand, has 100% biocompatibility, with an extremely low risk of allergy or foreign-body reaction, making it safe. What is especially noteworthy is the presence of adipose-derived stem cells (ASCs) abundant in fat tissue. It has been demonstrated that these stem cells regenerate and activate the surrounding tissue and improve blood flow, bringing a secondary rejuvenation effect (improvement of skin quality) that even improves the skin's firmness, color tone, and fine lines.

Under-eye treatments | Fat grafting vs. eye-bag creation: a thorough comparison

*Retention-rate data is based on a meta-analysis of authoritative medical research

Fat grafting vs. eye-bag creation—"which is for me?" The ultimate, regret-free way to choose

As cosmetic treatments that change the under-eye impression, "eye-bag creation" and "fat grafting" are often confused, but the anatomical site they target and the goal they achieve are completely different. Getting this wrong leads to an unnatural result, so caution is needed.

Gone in a few months? Or for life? The decisive difference in the durability of the effect

Eye-bag (aegyo-sal) creationis a localized treatment that injects hyaluronic acid above the orbicularis oculi muscle just below the lashes to create a plump, cute "eye bag (aegyo-sal)." It easily makes the eyes look larger, but because hyaluronic acid is absorbed by the body over time, it returns to its original state in about six months to a year.

In contrast,under-eye fat graftingfills the wide-ranging "hollows" and "shadows" from under the eye to the cheek, rebuilding a flat, smooth contour. It approaches from deep layers such as above the periosteum and the subcutaneous tissue, and once the injected fat connects with capillaries and engrafts (settles), its effect lasts semi-permanently. Compared with eye-bag creation, which feels like temporary makeup, fat grafting can be said to be the fundamental building of the facial foundation.

Determined by your features! A thorough explanation of suitable treatments by case

Choosing the optimal treatment to match your own condition is the key to success.
[Cases suited to eye-bag creation] Those in their teens or 20s who have no under-eye sagging or hollows and simply want to make their eyes look cute and wide. However, creating an eye bag for someone who already has dark circles or sagging emphasizes the step even more, making it unnatural and risking the opposite effect.
[Cases suited to fat grafting] Those from their late 20s onward who have started to mind under-eye shadows (black dark circles) or a bony, rough texture. It is ideal for those who want to fundamentally erase a tired impression and regain natural, youthful, flat eyes. It is an essential option as the base of dark-circle treatment.

"Is it true it all gets absorbed?" The retention rate and reality of fat grafting exposed by research data

Many people likely worry, "Even if I go to the trouble of injecting fat, won't it all be absorbed right away?" Here, from the objective data of authoritative medical research, we honestly present the real figures of fat grafting up front.

The retention rate and safety of autologous facial fat grafting have always been a topic of debate in the cosmetic-medicine world, and have been analyzed in detail in the latest findings such as Cederna 2024 and Azoury 2021, as well as in many authoritative studies such as Khouri 2017. According to a large-scale meta-analysis integrating this evidence (the most reliable statistical method, which pools data from multiple past studies), facial fat grafting has been clearly shown to havean average volume retention rate of 47% (95% confidence interval: 41–53%).

It has also been scientifically elucidated how the injected fat survives. While blood (nutrients) struggles to reach the center of the injected fat, in the boundary zone 1.5 ± 0.5 mm from the edge of the fat mass,about 40% of the tissue reliably survives—significant data to this effect has been reported.

In other words, to raise the retention rate, the advanced technique of "injecting tiny amounts of fat (such as 1/120 mL) finely dispersed across multiple layers," rather than "injecting a large mass all at once," is indispensable. When a highly skilled doctor uses fat appropriately purified by centrifugation or filtration, the incidence of serious complications is only 2.8%, proving it to be an extremely safe treatment.

"Can't I see people because of swelling?" An honest exposé of downtime and the post-operative course

Fat grafting is not magic. Since it is a genuine surgical procedure, downtime always exists. We tell you the reality of the post-operative course without hiding it.

For 1–2 weeks starting right after surgery, mild swelling and bruising (blue or yellow bruises) under the eye are common. According to the data, localized swelling or bruising is seen in about half of cases, but it usually disappears naturally within a short period of 3–14 days.

Also, as mentioned, anticipating a retention rate of about 47%, in the first session we inject a little more than the desired result in advance (overcorrection). For this reason, during the first month there is a period where you feel "is it a bit puffy?" After that, the fat that did not engraft is gradually absorbed, the final result is completed, and it becomes fully stable as your own tissue at3–6 months after surgery.
For those who seek immediate results, thinking "I want to be in perfect condition by tomorrow," downtime is a sticking point; but for those who want a sure rejuvenation effect months later and semi-permanent durability, it becomes the ultimate anti-aging care, second to none.

If you're wondering, "What about my case?"

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To avoid failure! A summary of the key points of this article

• The root cause of under-eye dark circles and hollows is a "structural step": The difference in elevation caused by orbital fat protrusion, subcutaneous fat loss, and ligament descent creates shadows.
• Understand the difference in purpose: Eye-bag creation is "temporary decoration at the eye's edge," while fat grafting is "the fundamental treatment of wide-ranging shadows (semi-permanent)." Getting the indication wrong backfires.
• The truth about the retention rate shown by data: The average retention rate shown by authoritative research is 47%. The technique of "micro-dispersed injection," which dramatically raises the survival rate, divides success from failure.
• Overwhelming results in exchange for downtime: It involves 1–2 weeks of swelling and bruising, but the risk of serious complications is low at 2.8%, and you also gain a skin-quality improvement effect from the power of stem cells.

FAQ (frequently asked questions about fat grafting)

Q1. Does the area where fat is harvested hurt? Is the scar conspicuous?

Fat is harvested mainly from areas with abundant good-quality fat, such as the inner thigh and lower abdomen, using a very thin cannula (suction tube) of a few millimeters. Because intravenous anesthesia (sedation) is used in addition to local anesthesia, you feel almost no pain during the procedure. The scar at the harvest site is also very small, about 2–3 mm, and since the incision is aimed at a position hidden by underwear or skin folds, it becomes barely noticeable after healing over several months.

Q2. If the retention rate is 47%, what happens if the effect is insufficient?

By calculating the amount of fat absorption in advance and injecting a little more than needed in the first session (overcorrection), we adjust so that the ideal volume is reached in the end. If, even so, absorption is high due to individual constitution and you feel the effect is insufficient, an additional injection (touch-up) can be performed from six months post-op after assessing the condition. In fact, there is also clinical data showing that the second injection has a better receiving environment, such as blood flow, than the first, and tends to have a higher retention rate.

Q3. Does it work on any type of dark circles—black, blue, brown, etc.?

Fat grafting exerts its most dramatic and direct effect on "black dark circles" caused by a step or shadow. It also greatly improves the color of "blue dark circles," where the underlying muscle or veins show through thin skin, because the injected autologous fat acts as a physical cushion (filter). However, for "brown dark circles" caused by pigmentation or spots from friction, although the surface can be flattened, the color itself is difficult to erase completely, so combination treatment with laser therapy or topical brightening agents may be recommended.

References

1. Strong AL et al.. "Technical Precision with Autologous Fat Grafting for Facial Rejuvenation: A Review of the Evolving Science." Plastic & Reconstructive Surgery, 2023. DOI: 10.1097/PRS.0000000000010643
2. Azoury SC et al.. "Modern Fat Grafting Techniques to the Face and Neck." Plastic & Reconstructive Surgery, 2021. DOI: 10.1097/PRS.0000000000008405
3. Khouri RK et al.. "Current Clinical Applications of Fat Grafting." Plastic & Reconstructive Surgery, 2017. DOI: 10.1097/PRS.0000000000003648

Naka

Supervising physician of this article

Hiromitsu Nakamura

Director of Zetith Beauty Clinic. Board-certified plastic surgeon. Member of the Japan Society of Aesthetic Plastic Surgery (JSAPS). He actively incorporates the latest evidence from domestic and international conferences and performs precise procedures tailored to each individual's bone structure and tissue.