How do you know if eye hollowness is causing dark circles?

How do I know if eye hollowness is causing dark circles? When I look down the circles get darker is that a sign of hollowness? Also when I looked in the mirror before while it was dark with just lights on the under eye area looks white when I look down and you can see the bone structure around the eye is that a sign of hollowness? In certain lights I can also see veins in the dark circles.

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