The Montenegro international is alleged to have bitten Rovers defender Owen Beck, who was sent off for kicking out at Duane Holmes in the same incident late in the second-tier game at Deepdale on Sunday.
"Milutin Osmajic has been charged following Preston North End's EFL Championship game against Blackburn Rovers on Sunday, 22 September," said a Football Association statement.
"It's alleged that the forward committed an act of violent conduct by biting an opponent around the 87th minute."
Osmajic, 25, has until Monday to provide a response.
Blackburn boss John Eustace said in his post-match press conference: "(Beck's) got a big bite mark on the back of his neck. He's shown all the lads. He's a little bit quiet, a little bit shook up."
Former Uruguay forward Luis Suarez, now of Inter Miami, served a number of bans during his career for biting incidents, including a 10-game ban when playing for Liverpool.