Hey, what's up. I have a concern to which you guys might be able to help me with. I've been administering my own injections in my left soulder. I think i've been doin it right untill the last one i did. I now have a knot on my left shoulder that hurts and its swollen. Its been two days and i've been icing it and stuff but it still remains swollen and painful . What did i do? What do i do? Is this serious or am i just over reacting. I don't know. HELP...