To edit my photos, I use Photoshop Elements. Even though it's the more simple version of Photoshop, you still get most of the basic tools while not paying $800. I got mine at the Washburn Bookstore for less than $60 with my Washburn ID.
Anyways, I've been using this program for the last three years and just discovered a new technique last night! It's the Adjust Color for Skin Tone feature, which allows you to adjust the levels of red and blue in portraiture shots. I'll give you this example, which is of two dear ladies, Betty and Jayne. This shot was taken in a bathroom and I did not want to use my flash, which brings out the natural light more but also has a tendency to make skin appear more yellow. I was able to fix it though with my new favorite tool!
After, using the Skin Color Adjustment tool