Dark circles under the eyes make you look tired and aged. While lack of sleep and stress are common causes of dark circles, your genes may play a role in darkening the skin under your eyes. The areas around the eyes are very delicate. Hence, appropriate care should be taken to prevent appearance of dark circles. However, if you have ignored the under eye skin care routine, here is an easy home remedy for reducing the dark circles with potato juice. Potato juice soothes the skin and lightens the under eye skin.