Why is there a bony lump in my right shoulder?

A few years ago, I rammed my right shoulder into the tiled bathroom wall whilst getting up from the toilet and losing my balance after slipping on a bathroom rug. Yes…silly. I didn’t bother to turn the light on, and it was late at night.

For a year, it ached horribly. I was told that it was not dislocated. Yet now, it feels different than the left shoulder. It’s as if there is a bone joint slightly jutting out.

I’m not concerned…there is no pain anymore. It just makes me wonder what happened.