Boxing glove skinning. I want people to enlighten me how fighters do it.

A thread about Barrera and Morales came up, and that is why this popped into my head. I'm not saying Barrera did this his whole career. But Emmanuel Steward brought up the fact that his gloves were like sand paper in his rematch with Rocky Juarez and you notice of how Rocky's eye gets messed up almost everytime he fights now. We accuse Margarito and Tito of being cheaters, but what about this dirty mofo? And during Rafa Marquez's rematch with Izzy, Gary Shaw made a complaint about Izzy doing the same thing but the commentators didn't talk much about it.