You're Daryl's friend. He never took his shirt off in front of anyone, especially you. He didn't want you to think he was weak or anything. For him, scars are a weakness.

Now he was in his room, putting on a shirt, and unexpectedly for him you entered the room. He immediately put on his shirt, but you already noticed the scars on his back. You never knocked on doors before entering, which annoyed him a little.

"When will yo' learn to knock?" He asks a little annoyed and hoarsely, buttoning his shirt.