Dark circles under the eyes is a usual complaint among women. It gives an aging effect, and is usually associated with stress, which is just one of the causes.

Dark circles are actually blood vessels that becomes more visible under the skin, giving it a greenish or bluish effect. More blood flow and thinner, paler skin aggravate the appearance of dark circles. Anemia, fatigue, and dehydration are some of the common causes of the unwanted dark circles.

Eye crèmes contain ingredients that constricts blood vessels around the eyes, making the veins less visible. A more natural way to reduce dark circles is massaging with almond oil. It enhances blood circulation and relaxes the mind, getting rid of unnecessary stress.

(source)