The eyelid skin is the thinnest in the body and many people with dark circles under the eyes have extremely thin skin on their eyelids and around the eyes. This thin skin is an inherited trait. The dark circles under the eyes are caused by the fact that the purple color of the underlying eyelid muscle shows through the thin skin and creates a bluish or purple color. The color is darkest near the nose and on the lower eyelid near the nose.

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