What causes dark circles under eyes?

There are various reasons which cause dark circles. Few of them have been listed below.

Heredity:

If others in your family have dark circles then there are fair chances of you getting dark circles under eyes. The thinness of under eye skin is a hereditary character. The thin under eye skin reveals dark veins underneath and appears
as dark circles under eyes.

If you are more prone to allergies like itching of skin which is inherited then dark circles under eyes may be caused due to rubbing and inflammation of under eye skin.