What is a good concealer for someone with somewhat red/severe acne?

I've found that the green concealer is best for red spots...I've used skin-colored concealer but you have to use so much to cover red spots that it looks horrible. So instead I use Neutrogena's skin-clearing concealer in green - you can buy it at Walmart or at drugstores. You only need a LITTLE bit - dab it on with your finger so the tip of the applicator doesn't get contaminated with acne bacteria (otherwise you'll just make your other zits you cover with it worse). The green cancels out the red better than any thick skin-colored concealer does. Make sure it dries first and then put foundation on over it. If you use too much of the concealer, your foundation will look really greenish in tint...so use as little concealer as possible. You do need a highly-pigmented foundation to cover it adequately. I hope this helps!!