What this site is for
This is patient education about the darkness under 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 this is happening, 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
Four different problems are called dark circles. Pigment is held in the skin. Vessels show through skin that has thinned. A hollow along the tear trough catches shadow. A fat pad that has pushed forward throws a shadow of its own. They look alike in a photograph, they are assessed by different observations, and they are treated in directions that do not overlap — which is why a treatment chosen before the kind is named is a guess, and why filling a bulge mistaken for a hollow makes the area worse.
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 an alternative to treatment for a structural cause, or a device as a substitute for an operation where an operation is the honest answer. It does not describe surgical technique, because that belongs to the pages that cover the surgery. And it does not treat a one-sided change, bruising without injury, a lump or persistent swelling as an appearance problem at any point.
The limits of a website
Nothing here can tell you which of the four kinds is present under your own eyes. That requires someone to look at the area in two different lights, to stretch the skin and to lift the cheek — observations that take under a minute 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.