Blue/Green - red and pink(salmon) color concealer
Purple - yellow color concealer
Red - green color concealer...But I normally cover up my red spots with a beige color with no problem.
Brown - white, lighter color concealer
Yellow - light or lavender color concealer
First, apply the corrective concealer, then you apply a thick layer of natural color concealer on top.
I had a series of subcision treatments. Every time, I got a subcision, it's impossible to cover up bruises for 5 - 7 days (especially the darker blue, purple,and greenish one). Be careful, bruises are very visible under the sun light(One time, I thought I completely covered my bruises using my bathroom light. But when I checked my face under the sunlight, my face looked like I got into a fight lol...). But don't worry, usually after 10 days, it's pretty easy to cover them up(at least for me)!
I also recommend Arnica tablets. You should start taking them a few days prior to your sub treatment. It helps healing bruises faster.
Good luck Nicky!