Here’s a quick video in which I walk through a very simple technique for correcting too much red in faces using just Lightroom.
I picked this tip up from Aaron Nace’s tutorial on a similar technique in Photoshop. I generally try to avoid going to Photoshop if it is something I can deal with in Lightroom. It’s just faster and a preferred piece of software for me.
If you need to do this in Photoshop, check out this Phlearn video for an explanation of how to accomplish this inside Photoshop, where you’ll have much more control in isolating colors.