The number one reason we see dark circles under the eyes is because of volume loss in the tear trough.
There are several things that can lead to dark circles.
Some are born with less fat in the under-eye area and therefore have an indentation commonly referred to as a tear trough hollow. However, lifestyle factors such as sun exposure, allergies and dehydration can all affect the under-eye area. In addition, as we age our tissue goes through ‘cellular aging’ which means we don’t turn over the cells like we did when we were younger.