What this site is for
This is patient education about the hollow beneath the eye, published by Chongqing West District Hospital, a tertiary general hospital in Jiulongpo District, Chongqing. It is a concern guide rather than a procedure page: it answers why the hollow is there, whether it needs treatment, and which of several paths applies. The operations themselves, and the anatomy they work on, are explained on the eyelid hub and on Dr. Mao’s own site, and repeating them here would help nobody.
The distinction the site is built on
An under-eye hollow and an under-eye bag produce the same shadow and are opposites in tissue. One is volume that has gone from along the rim of the orbit; the other is fat that has pushed forward out of it. Volume answers the first and worsens the second, which is why the commonest error in this area is made by treating the shadow rather than the cause. That is also why the position and tone of the lower lid are recorded before any plan: a lid that cannot hold its position changes what any option can safely achieve.
What it deliberately does not do
It does not name products or brands, quote prices or dosages, or promise a result. It does not present a cream as a way to restore volume, or a filler as a substitute for surgery where the problem is fat that has moved forward. It does not describe operative technique, because that belongs to the pages that cover the procedures. And it does not treat a change in one eye only, a change over weeks, a growing lump, a bulging eye, or anything that follows an injection in this area as an appearance problem at any point.
The limits of a website
Nothing here can tell you whether your own hollow is volume loss, a tethering ligament, the shape of your bone, a bulge or fluid. That requires someone to look at the area in overhead light, to lift the cheek and watch the groove, to feel what lies under the skin, and to record how the lower lid sits — observations that take minutes in person and cannot be made from a photograph. Use this site to arrive at an assessment with better questions, and treat any answer you receive here as general information rather than as advice about you.