Bryant allegedly slapped his mother and pulled her hair during an argument Saturday, DeSoto, Texas, police said.
Police did not immediately arrest Bryant because there was no evidence at the scene of an assault. Evidence of the injuries surfaced a day or two later, DeSoto Police Capt. Ron Smith said at a Tuesday news conference.
Bryant turned himself in Monday and immediately posted bond. The alleged crime is a Class A misdemeanor in Texas, punishable by a fine and up to a year in jail. Bryant could also face punishment under the National Football League's personal conduct policy if convicted, the Fort Worth (Texas) Star-Telegram said Tuesday.
"It's pretty straightforward. He and his mom got into an argument. It's physical. She got some injuries. We made the arrest," said Smith.