Persistent dark circles that are not simply a sign of tiredness are caused by pigment deposits under the eye. These pigments are by-products of the breakdown of haemoglobin, the oxygen-transporting component of red blood cells, and the reason they show up in the eye area is that this is where the skin is at its most delicate, thin and fragile.
In Chinese medicine, the eyes are linked with the liver and so any stress on this organ could affect the eyes and surrounding area. Sufferers may benefit from taking a liver cleanse. Gotu Kola will help take down puffiness and inflammation.