For some individuals, dark circles can be an inherited trait. Apart from these, eye circles can be caused by some other factors, including allergies and hay fever, asthma, eczema, dehydration, anemia (especially iron deficiency anemia), poor blood circulation, nutritional deficiencies (especially a deficiency of vitamin K), fatigue, a lack of sleep, liver diseases, and certain medications that can dilate the blood vessels, including those present under the eyes.