Many people of all ages complain of dark circles under their eyes. The phrase “dark circles under the eyes” is used to describe a wide variety of different conditions, but the phrase dark circles under the eyes refers to a very specific anatomical condition of the lower eyelids that is easy to diagnose and readily corrected by modern techniques. However, many people who complain of dark circles under their eyes frequently have a condition more appropriately termed “hollow eyes’ which is a distinct anatomical condition very different from dark circles under the eyes. Recognition of the “hollow eye syndrome” is very important because the technique frequently used to treat “dark circles under the eyes” does not correct the hollow eye look and can actually make the ‘hollow eye syndrome’ worse.