Under-eye bags: why we reposition the fat instead of taking it out

Under-eye bags are usually fat pushing forward from around the eye. The obvious question is whether some of it can just come out. It can, and for decades lower eyelid surgery did just that. We now advise against it in nearly every case. Here is why moving the fat took its place.

Why we keep the fat

Take the fat out and the bulge is gone the moment surgery ends. The trouble comes later. With age, the under-eye and cheek lose soft tissue and sag, and the bone beneath changes too. If the fat is already gone, there is too little volume left to hold the area up. The bony rim starts to show, and the eyes look hollow.

Thirty years ago, a plastic surgeon noted that taking the fat out could leave a sunken, "operated" look. His answer was to keep the fat and move it down over the rim of the eye socket (Hamra 1995, PMID 7624408). Once removed, fat is hard to put back, which narrows your options later on.

The fat moves down

Just below the bulge is a groove called the tear trough. A ligament at that spot holds the skin down to the bone. Repositioning is not simply shifting fat around. The surgeon releases that ligament (Wong 2017, PMID 28746272) and moves the fat over the rim into the space it leaves. The fat is never cut free, so it keeps its blood supply (Goldberg 2000, PMID 10697189).

Filling that space keeps the ligament from reattaching as easily, so the groove is less likely to return. The operation is done through the inside of the lower lid and leaves no scar on the skin.

Some of the fat shrinks over time, more in some people than others. Even so, among 24 people followed in one study, the fat survived and settled in within one to two months (Goldberg 2000, PMID 10697189).

When it is more than fat

If there is extra skin or the cheek has sagged, repositioning alone is rarely enough. Lower blepharoplasty fits better. It moves the fat the same way, then trims the extra skin and lifts the tissue that has dropped. Repositioning suits you when the bulging fat is the main problem and the skin is still fairly firm.

Fine lines and other shallow changes are a different matter. They sit in the skin, so surgery is not the right tool. For those, skin tightening treatments such as Sofwave or Eye Thermage FLX make more sense. Whichever route fits, the result and the recovery vary from person to person.

So an under-eye bag is not a question of whether to take the fat out. Cut it away and the area looks smooth for now, but it often hollows out later. Move it down and it fills the groove that would otherwise deepen. The real choice is between repositioning and lower blepharoplasty, which we compare in Under-eye fat repositioning or lower blepharoplasty: which one do you need?.

References

1. Hamra ST (1995). Arcus marginalis release and orbital fat preservation in midface rejuvenation. Plast Reconstr Surg. PMID 7624408 (opens in new window).
2. Goldberg RA (2000). Transconjunctival orbital fat repositioning: transposition of orbital fat pedicles into a subperiosteal pocket. Plast Reconstr Surg. PMID 10697189 (opens in new window).
3. Wong CH, Mendelson B (2017). Extended transconjunctival lower eyelid blepharoplasty with release of the tear trough ligament and fat redistribution. Plast Reconstr Surg. PMID 28746272 (opens in new window).