A tear trough is an area of hollowing under the eye which can cause a dark shadow, which results in a tired appearance.
For many people, the dark area under the eye is caused due to two things- hollowness and pigmentation. It can be the result of genetics or the natural ageing process. Many people develop hollowness under the eye because of volume loss in the cheeks. Therefore, it may be recommended to restore volume in the cheeks first which will help to reduce under eye hollowing.
Hollowness can be corrected using dermal fillers which will help to smooth and plump the hollow area, however it will not affect pigmentation. Pigmentation can be treated using medical grade skin creams. The combination of both treatments helps to give the eyes a bright and refreshed appearance.