This is a great tutorial from Sara Kiesling. She breaks down a very simple and effective way to touch up skin with out over blurring or smoothing. I went ahead and created an action for two steps in her tutorial that will save time (Download here). You will still need to follow the tutorial and remove blemishes, but the action will get you to that point faster. Take a look and be sure to visit Sara Kiesling's site and check out her work!