Allright. Go to select Color Range. With this tool you select the color range of the skin (keep shift pressed to select a whole range). With the fuzzyness you can set the preciseness of the selection. Make sure you select all skin (some stuff that gets selected in the process which you don't want you can subtract later).
Now when you have selected that, jump the selection to a new layer twice (Command J or Ctrl J). Make the top new layer invisible and start working with the one below. Select the content of that layer (Command click in the thumb of the layer palet), now go to filter average (the whole thing is now kind of a skintone blur). Set that layer to layermode hue. Go to the top layer and make it visible again, put this one to layermode luminosity.
The first layer you made (hue) is to get the color misery go away, the second (luminosity) is to get the texture back.
This procedure works very well to get color blotchyness out not necessarily blotchyness.
You might try using Gaussian blur and keeping the layer to normal (instead of average & hue). Than the second layer again on luminosity but at 50% opacity (or anything else that suits your needs). This does get rid of some of the blotchyness.
Hope these directions are helpful to you.
Sample of the last method. It does smooth it out somewhat and you can dial in the texture with the opacity (the layer set to luminosity).
Now, if someone could explain me how I can embed images here with those cute thumbs ?