Inj my delt on thursday with 1ml of Prop(100mgs/ml), wasn't a very good inj, abit of movement. I trained shoulders yesterday and in the evening it has swollen up. It doesn't look like a golf ball or a lump, just the whole muscle is bigger. Also not red, slightly warm but this maybe the fact i've had a few hot showers, but i do have a little pain. Do you think this could be an abscess or have i just suffered a bit of muscle trauma and irritated it when exercising?