I injected into my right pect on Tuesday. By Thursday it was so sore I couldn't do shoulders or push anything above my head. On Friday night I did bi's and tri's every thing was feeling good till I got home. The spot where I have a knot at is a little ways off from where I injected. My question is does this sound like a pinched or torn muscle? When I run my fingers over it it feels like a bump the circumference of a small egg.