In my left shoulder, it started by what sounded like a small pop like something knotted happened in my shoulder whilst doing inclined bench press with dbs, the same thing happened a few times that year, I was kind of new to body building and worked through it.
Now I have one side developed considerably more than the other side. I have taken months off and rested it which made no difference and have tried physio therapy, osteotherapy and had an ultra scan which showed a perfect working shuolder.
The only things that help it is antiinflamitrys and not resting it too much as I find if I rest it it doesn't help at all and if i wear my big leather coat which is a little constricting that makes it worse too even if I am not training.
the problem is still there though, a pain on the side of my shoulder right in the middle which hurts to press and I can actually feel exactly where it is hurting, it is on the outside near to the skin.
P.S. What ever i do in the gym to build that side up including allot more reps my otherside is still looking considerably more developed.