I'm talking to someone last week, decent size, some acne, and the shoulder shoot zones on each shoulder are uncovered, gross and obvious.
This is completely outside of the gym in a work/social situation. I see it on one side, and there it is on the other side. People who have to be sleeveless to do everything.
Do you ever mention it to the person "your injection zone is showing" or "dude, cover up that unhygienic mess"?