Mixed martial artists put their bodies on the line each time they take to the octagon.As the most competitive promotion, UFC fighters are no exception, regularly enduring beatings as a result of punches, elbows, leg kicks and even knees. Unsurprisingly, that has led to a number of grotesque injuries throughout its storied history.While battling it out in pursuit of titles, rankings and often just pride, several stars have been left horribly disfigured through facial damage.