dark under-eye circles are due to several causes: genetics allergies rubbing and stress/lack of sleep. part of the issue is vascular (due to the blood vessel network just under the skin) and part is due to actual pigmentation. it is important not to rub the area ever to control allergies/sinusitis as much as possible to get enough sleep and to use a good concealer.
is there any treatment for hyperpigmentation around the eyes?