The typical causes of dark circles are poor blood circulation due to fatigue, insufficient sleep and mental pressure, so the dark circles under your eyes are indicative of poor condition that your body is in. You should take sufficient rest and keep yourself relaxed. If you feel the dark circles do not look nice or proper when you go out or date, you can pour boiling water in the washbasin to steam your face for two to three minutes and then apply cold towel on your eyes. As eyes are liable to be dry, so you had better use moisture cosmetics to replenish water. Massage has a good effect of reducing the dark circles, too. In your daily life, you should balance your diets and eat more fruits with rich vitamin C and do appropriate amount of aerobic exercises.