You spent all night coaxing a screaming toddler for eight miserable hours. Obviously you're tired. And obviously you don't want people to comment on it or else they might get punched. (Trust us, we get it.) For your—and others'—benefit, Dr. Sheila Nazarian, MD, board-certified plastic surgeon and RealSelf advisor, who as a mom of three has plenty of recommendations based on personal experience. According to Nazarian, the shadowing in the concave regions of the tear troughs is what causes dark eye circles. Insert some medical-grade filler into the tear troughs and under-eye circles will suddenly be a problem you won't have to think about for nine months to a year.