The most common causes for dark circles under the eyes are ... heredity, allergies, dehydration, lack of sleep and possibly anemia.

Heredity and allergies cause the the tiny capillaries in the delicate under-eye area to be inflamed and more pronounced .. they'll be more noticeable because the skin there is so thin.

Lack of sleep, dehydration and anemia may give the appearance of darker under-eye circles because they tend to cause the rest of the face to be paler than usual. So, the circles seem darker in comparison.

Here's some info. from MotherNature.com which may be helpful .. Eyes, Dark Circles.

hth,


Doreen