Hi, I have played around with the tech nique but am using Fireworks -I'm sure you'll be able to transfer the technique to Photoshop.
First you need to prepare an image that will provide the shaved skin effect - I cropped out part of another photo and made a roughly 100 px square to provide the texture I would use.
Then on your main image, use a good size chunky font and find the 'other' option from colour / fill / patterns - in Fireworks this then allows you to browse to thetiny image you made.