Under-Eyes: Hyaluronic Acid or Fat Grafting?
Both options fill the hollow of the tear trough, but they are procedures of a different nature. Hyaluronic acid is injected in the office, in small volumes, generally lasts 9 to 12 months and can be broken down with hyaluronidase if something does not go as planned. Fat grafting is a surgical procedure: fat is taken from another part of the body, processed and injected. Part of it is reabsorbed, and the part that integrates tends to last many years, but it cannot be undone with an enzyme.
This page is a general comparison to help you advise the patient who asks about fat. Who may perform the graft and how it is done follow the rules of each professional board and the judgment of whoever performs the procedure.
What is the difference, point by point?
| Aspect | Hyaluronic acid | Fat graft |
|---|---|---|
| Nature | Injectable, in the office | Surgical, with fat taken from the patient |
| Material | Manufactured gel, registered | The patient's own fat |
| Predictability | Good in small volumes | Lower: part of the fat is reabsorbed |
| Usual duration | Generally 9 to 12 months, sometimes more | The integrated part tends to last years |
| Reversal | Can be broken down with hyaluronidase | No enzyme; correction is harder |
| Recovery | Swelling for days, nearly normal routine | More swelling, two areas recovering |
| Adjustment | Simple top-up at the follow-up | New graft, if needed |
| Association | Often combined with the cheekbone | Often combined with other surgeries, such as eyelid surgery |
Why does fat last longer, and why is that a double-edged sword?
Grafted fat that "takes", meaning it gets blood supply, becomes living tissue of the patient. That is why it tends to last much longer than an absorbable gel. But that same fact has two consequences: the amount that will survive is not exactly predictable, and what survives behaves like fat. If the patient gains weight, the area may gain volume; if they lose weight, it may lose volume.
In the lower eyelid, where the skin is thin, any excess or irregularity shows. With hyaluronic acid, an excess can be corrected with hyaluronidase, at the professional's discretion. With fat, correction is more laborious.
What are the risks of each?
Hyaluronic acid: prolonged swelling around the eyes, irregularity, a bluish tone from the Tyndall effect and, as a rare and serious event, vascular occlusion. The details are in does under-eye filler carry risk?.
Fat graft: irregularities, lumps or nodules, oil cysts, too much or too little volume, asymmetry, risks from the donor area and from the surgery itself. Vascular risk also exists with fat injected in the face.
For whom is each option usually discussed?
Hyaluronic acid is usually considered when the circle is structural, with a shallow to moderate hollow, skin of reasonable thickness and no evident fat bag. It is the most common option for those who want an office procedure with gradual adjustment.
Fat grafting usually comes into the conversation when volume loss is greater, when there are other areas to treat in a surgical setting or when the patient is already having eyelid surgery. If the main concern is eyelid fat bags, neither filler solves it, and surgical assessment of the eyelid is the path.
If the circle is pigmentary or vascular, neither gel nor fat treats the color. The classification is in pigmentary, vascular or structural under-eye circles, and the conversation with the patient in does under-eye filler get rid of the purple?.
What should you ask a patient who has already had a graft?
And durability, in practice?
| Period | Hyaluronic acid | Fat graft |
|---|---|---|
| First weeks | Swelling subsides in about 2 weeks | Greater and longer swelling |
| First months | Stable result | Part of the fat is reabsorbed |
| 9 to 12 months | Effect starts to fade in many patients | The remaining volume tends to stay |
| Following years | Reinjection according to reassessment | Follows weight and aging |
The timeframes for the gel are in how long does under-eye filler last?, and the time to see the result in under-eye filler: result and sessions.
Where does Harmy fit in?
In Harmy, the tear trough corresponds to the Tear Trough point. The projection shows an illustrative simulation of smoothing the area with the planned ml, and it serves to discuss the expected effect, not the material. It does not distinguish gel from fat and does not predict durability. If the plan includes support for the midface, the Cheekbone point comes in too, as in cheek filler.
Frequently asked questions
How long does under-eye filler with fat last?
Part of the grafted fat is reabsorbed in the first months, in a proportion that varies from person to person. The part that integrates tends to last many years, but it follows weight changes and aging.
Which is better for under-eye circles, hyaluronic acid or fat?
It depends on the case. Hyaluronic acid is done in the office, is predictable in small volumes and can be broken down with an enzyme. Fat is a surgical procedure, may last longer, but cannot be undone with an enzyme.
Is under-eye filler with fat surgery?
Yes. The fat has to be taken from another part of the body, processed and then injected, which makes the graft a surgical procedure, generally done in a surgical setting.
Can a fat graft under the eyes be corrected if it turns out irregular?
Correction is harder than with hyaluronic acid, because there is no enzyme that dissolves fat. Irregularities may require other procedures, according to the assessment of whoever performed the graft.
Harmy images are illustrative simulations generated by AI from the patient's photo to support the conversation between practitioner and patient. They are not a promise of results. Indication, technique, product and volume are solely the decision of the licensed practitioner. This content is for information only and does not replace a clinical assessment.