Every since I was young, I've had dark circles or "bags" under my eyes, no matter how much sleep I get

I put concealer on
every day before school and between periods sometimes. Its soooo annoying!! In the morning it takes me 20 mins to put this stuff on and I'm getting so sick of it...for five years I've been doing this!!
I have no idea why they are there!! I have a deviated septum (spelling?) and I thought that was the reason why, but my aunt who has the same issue got her septum corrected and still has them just as badly. She's getting a laser treatment done to get them removed (its a new thing...kind of experimental), and if it works for her, my mom said she'd cough up the $1000 to get it done for me.
Do you guys know of any other possible reasons why theyre there and of any treatments?
Lucy