I've practically given up wearing foundation, I would like to use a concealor from time to time. Preferably something with a yellow under tone. I can never the exact right shade for a concealor. I would consider mixing two togerther.

MAC. They have a variety of concealers (light-weight to thicker). They also have yellow tone shades and pink tone shades. I use the thicker one called Studio Finish. Its really thick so it covers my acne scars really well. My face looks so flawless when I wear the concealer.

I like the concealer from The Body Shop....non-drying