Any thoughts or experience with the possibility of forming scar tissues mass from injections? We've heard about Lyle Alzado, I think it was, describe in an interview how he had a baseball (i think) size scar tissue lump removed from his glute. I rotate sites, etc. Also....I draw with a 20g and shoot with 23....is this ok for now? Would rather use 25g to shoot with but all I have is 23 right now. Would it be advisable to get 25g if I can and do away with the 23g. I know I want to hit delts quads and glutes for now. How necessary is it to venture into bicep, calve etc.?