Who bruised Johnny's face with the rings on his hand in the outsiders?

In "The Outsiders," Johnny's face is bruised by Bob Sheldon, a member of the Socs. During a violent confrontation, Bob attacks Johnny and Ponyboy while they are in the park, leading to Johnny's injuries. This encounter highlights the ongoing conflict between the Greasers and the Socs, ultimately impacting Johnny's character and the story's events.