First I've ever heard of it, and what's a sharp skin?
SHARP = Skin Head Against Racial Prejudice. I doubt Dorian was a Nazi Skin. Back in the day when he got that tat, skins were more a rebelious youth punk subculture in England.
In America today Skins = Neo's for the most part, We (as well as the rest of the white world) adopted the look, because you can't wear a Nazi uniform to work because people will be offended, but you can shave your head bald.