What are dark circles under the eyes and why do dark circles under the eyes occur?
It's not surprising that the eyes are the first to be affected. The skin under the eyes is very thin, as it doesn't have the usual layer of fatty tissue. Instead, there are lots of little blood vessels and lymph glands. If the body lacks oxygen or fluid, the blood flows slower and is darker in colour. Blood vessels are visible through the fine, almost transparent, skin around the eyes. Depending on your skin type, the shadows and dark circles under your eyes will either be brownish or blueish. In some families, dark circles are genetically determined, meaning that particularly fine skin around the eyes has been passed on in your genes.