Black Eye Circles: How Are They Formed? 😴 The reasons for the formation of eye bags vary widely, including genetic factors, skin laxity caused by aging, overwork, lack of sleep, and unbalanced diets. Additionally, allergic rhinitis or eczema may also lead to dark circles under the eyes. Maintaining good living habits, such as regular rest, healthy eating, and moderate exercise, can effectively prevent the formation of dark circles. For already formed dark circles, they can be alleviated through methods like using eye cream, cold compresses, and massage.