If you shoot jpg, try doing a custom white balance in-camera with a grey card. White balance issues are a lot easier to fix (after the fact) if you shoot in RAW format. If you can get your white balance correct I think you'll be happy with skin tones.Skin tones are my big struggle right now too.
Oh Jess, you are right about the RAW format, in fact everything is better in RAW! I'll start paying attention to my white balance. Thank you!