C.R.
I too am olive toned and have some chin acne issues as well as darkness under my eyes. I use Dermablend. This stuff works!
I would recommend using the quick fix for around the eye so it doesn't crease up. Cover cream covers everything else REALLY good. http://www.dermablend.com/
I also use everyday minerals and LOVE their concealer as well. I use the one that is yellow toned and it really surprised me how well a mineral powder could cover! They offer a matte line and I love their make up!
C.