Several changes may occur in the lower eyelid that cause bags and dark circles. A youthful lower eyelid is full, short, and has no dark circle under it. With aging of the face the fat from the cheek and the lower eyelid separates. This occurs because the cheek descends or droops with aging which makes the lower eyelid look longer and allows the eyelid fat to move forward. This scenario creates an empty space between the fat of the lower eyelids and the fat of the cheek just at the edge of the bone along the lower eyelid. The situation can be described as two mountains separated by a valley. The first mountain is the bulging lower eyelid fat. The second mountain is the drooping cheek fat. The valley lies in between. In overhead lighting the bulging fat of the lower eyelid creates a shadow in the valley, “dark circle”, at the intersection of the cheek and lower eyelid.