Tavegg
Super Freak
I think it's to give him a "worn" look and to break your eyes focus on any specific spot. In pieces that are all shinny with smooth surfaces, your eye is able to pick out small imperfections. These very subtle dots scatter that focus to make it appear uniform. That's why they are covering his entire body.
That or this guy has the worst case of chicken pox I have ever seen!
Chris
Haha the pox
Your right on though. Light just went off in my head. Makes complete sense