What you want to do is very basic and a few minuts at most to do but you still need an understanding of the software to get he best results
Layers masks and feathering.
Adjustment layers and soft brush
Combinations of the above
you could just select the face and then use any of the adjustment tools eg hue and saturation, levels, contrast, replace colour, selective colour, channels etc etc
theres usually a ton of ways to do anything in photoshop and most other photosoftware
you need at least a basic grasp of layer, masks and selection tools
youtube has a gazillion vids on how to do all this kind of thing inPshop, Pshop elements, GIMP, Net.paint etc etc, they all work roughly the same