My arm was bent (with my hand near my head), I was carrying a scaffolding buck and I let the weight of it come down on my bent arm. I felt something pop and now my skin is very flabby and not as tight as the other arm. I am wondering what it was that popped. I know it wasn't a distal bicep tendon tear since my bicep is still in place. The loosening of the skin is what I'm worried about.