The first thing that you need to do is to choose a picture that you want to fix the skin color on and open in Photoshop. I do want to warn you that this will not totally fix photos that the skin color is off really bad. You only want to use the fix for photos that have a slight to moderate problem.
The next step is to make a new Hue/Saturation adjustment layer on top of your original picture. You can do this by clicking on the icon below the layers that looks like a half colored in circle, and clicking on Hue/Saturation. This will bring up the Hue/Saturation window and make it on its own new layer.
Next, with the Hue/Saturation window still open, you want to determine which color is overriding your skin color. Like I said previously, I seem to have the problem with the reds, so I am going to choose the reds for my picture. You can choose the color that you need to in order to fix the skin color in your picture. You can choose the color using the drop down menu in the Hue/Saturation window.
Next, take the Saturation slider and slide it to the left until the skin color looks pretty good, or the best that you can get it without looking fake. Don’t worry about the other parts of the picture right now. Just concentrate on the skin color. We will fix the background colors next.
Once you are satisfied with your skin color, click OK to close out of the Hue/Saturation window, and you will see your new layer above your original picture. If you notice though, the adjustment that you made affected the entire image. To get that back restored to normal, click on the layer mask part of the new layer, and grab your brush tool. Make sure that your foreground color is set to black, and you have a large enough brush so that you are not brushing the background back a long time.
Now, using black, brush in the parts of the photo that you want to restore back to normal. I usually brush in the whole picture except the skin areas that I wanted to fix. This gives me the most realistic look. You are now done with the Photoshop tutorial on how to fix skin color in a picture.