which "shows you how you can quickly and easily use Magic Bullet Colorista II for cosmetic skin retouching. You'll learn simple and effective techniques for subtly downplaying signs of age (such as wrinkles or skin blemishes), and giving pale skin a healthy color, without effecting other elements in your shot."
05 - Cosmetics: Skin Retouching with Magic Bullet Colorista II from Red Giant Software on Vimeo.
For more, see an earlier post "Correct" skin tones and others tagged skin.
Update: See also Quick Skin Tone tutorial in FCP: