Just something to keep in perspective. Zimmerman was treated by a paramedic at the scene and he was presumably cleaned up so that he could be treated. The police report clearly states that Zimmerman was bloody and battered, that he had a gash on the back of his head. There is a certain level of conspiracy involved here to have several police and a paramedic colluding on this statement. Zimmerman's lawyer also repeatedly mentions that Zimmerman's nose was broken.
The Daily Caller has examined the ABC News clip of Zimmerman arriving at the police station and it appears that there might indeed be a gash on Zimmerman's head.