I have the Green tube concealer [looks like lipstick] from Physicians Formula. I got it for the same reason as you, to cover up acne scars. It works really well for me.

Don't use foundation because it will only make your acne/pimples worse. Just try a tinted moistrurizer. That's what I have been using and my skin is doing a lot better. Btw, I got my tinted moisturizer from Sephora.