No one likes dark circles under their eyes, as it makes them look tired and unwell.
Dark circles under the eyes can simply be due to the skin being discoloured surrounding the eye area.
Or another cause can be because the skin is so much thinner and therefore more transparent, so it looks darker.
Although dark circles can sometimes be caused due to diet, lifestyle, or lack of the correct eye care, dark circles can also be hereditary and therefore difficult to treat.