Q. What causes bags and puffiness around the eyes and dark circles underneath them?
A. Gently pinch the skin under your eyes and give it a little tug. You'll feel that it's a little looser and thinner than skin elsewhere. As we age, some of the fat under the skin of the face disappears and gravity tends to pull what's left downward. Bags form under the eyes partly because there's less fat supporting the skin, so it becomes slacker. Thinner and looser skin also allows fluid to collect, causing a puffy appearance. The dark circles — not true circles, of course — under the eyes are caused by blood pooling in the veins just under the skin. The skin there is especially sensitive to sunlight, so some of the darkness may be from pigment. You've probably noticed the puffiness around your eyes after you first get up in the morning, and the dark circles may be more visible then, too. You're seeing the consequences of being in a horizontal position, which creates a greater tendency for fluids to accumulate around the eyes and for veins to expand (dilate) so they hold more blood.
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