Dark under eye circles make you look tired and make you look older and are very frustrating to treat. A lot of products out there promise to lighten those circles but in reality and unfortunately the only thing they lighten is your wallet. The reason that these are so difficult to treat is because they are caused by any combination of seven different problems. There are two types of brown in the skin that cause them at two different levels of the skin. There are three types of enlarged blood vessel hey can be purple, blue, or pink. And there are two types of shadows that cause the ne shadow comes from the bulge of fat from the lower lid as we get older and the other comes from fine wrinkling of the lower lid skin which appears as parallel lines which when light hits them from above causes shadows just like light hitting open flat, parallel Venice blinds. Because it is so difficult to find the right product for you, instead of being frustrated and using random products, if you have dark under eye circles, see your dermatologist so he can help you find out what the cause of your circles are and help you treat them.