Eye-on-Things-10-Fall-Eyeshadow-Trends-that-Have-Real-Vision-photo10A number of factors cause dark circles under eyes, from the temporary oopsies that you can control (lack of sleep or a hangover) to genetic predisposition that is much harder to fight. Dr. Jessica Wu, dermatologist and author of Feed Your Face says, “When you’re tired, your blood vessels dilate and eyes get puffy, creating shadows. This makes dark circles more prominent, but it’s not the cause.” So, what is the cause and how to get rid of under eye circles once and for all?To reduce puffiness and lessen those shadows that make you look tired, worn down and, well, older, here are our favorite 15 beauty hacks to help you wrangle dark circles under eyes.