OK so we all know about dark circles. Thankfully we have our trusty concealers and foundations to mask this problem, but do you really know what causes those pesky dark shadows underneath your eyes? You probably know one or two, but check out this informative video below. One of our favorite YouTube beauty gurus, Michelle Phan, schools beauty junkies everywhere on the exact causes of dark circles and offers up some cool ways to eliminate them. We agree with Phan that sometimes dark shadows around the eyes can make you look sexy (ahem, the smoky eye), but there aren't always so glamorous. Watch and listen as Michelle gives you an in depth beauty lesson on what dark circles are, why we get them and how to get rid of them!

Are you prone to dark circles? What do you do to help fade them? Share your beauty secrets in the comments below!