Stop what you're doing because I've just found a concealer which is beyond fabulous! In the States they use AmazingConcealer by Amazingcosmetics by the bucket load on film sets and now I've tried it I can see why. It's really light yet still goes a long way and works just as well at covering dark shadows as it does imperfections. It's £22 but as it's from QVC you get a 30 day money back guarantee you can try it out and see for yourself. Genius!
AmazingConcealer, £22, www.qvcuk.com