Simple tutorial how to do white skin.
Open image and create new adjustment layer Black&White. Make Opacity 30%.
This layer responsible for the picture desaturation.
Next do dublicate Black&White layer and change blending mode to Screen. Opacity 40%.
This layer responible for brightness.
Make again copy of Black&White layer and change blending mode to Soft Light.
Thi layer responsible for image contrast.
And refund some of part effect by mask.
At last do some fine tuning. Just add contrast by Levels layer.
All settings opacity do by your taste.
And one of important things — all of color slider you can change by taste too. We have 3 different image options (saturation, brightness, contrast) and in each of these option we also have 6 adjustment. It really flexible method to do white skin effect.
Thanks for your attention!
Also you can read this post on Russian in my blog on Russian language: http://sergbrezhnev.livejournal.com/2518.html