What causes dark circles under kids eyes?

Anyone else’s kids have dark circles under their eyes? What could it mean? They take vitamins and get enough sleep daily. Doctor didn’t seem concerned but I am… help!!

It can be genetic for some people, but if you’re concerned ask your child’s pediatrician to do a CBC blood test

Mine gets them when she is fighting virus or feeling unwell

My granddaughter has them all the time but drinking lots of fluids lightens them