That is why I dont do biceps, I NEVER have, it just freaks me out to think about it. Biceps are like quads, you cant live without them, if you make a mistake its going to f#ck your workouts for at least a week.
My last quad shot hit me so bad I was out of the gym for a week (I could hardly walk), and I didn't do legs for 3 whole weeks, I'm still coming back from that I lost alot of leg muscle because of it and its not easy for me to get it back.
* Break in virgin spots with sterile oil or weak/painless gear
* If it even causes minute feelings of pain anywhere else, cut that shyt way down or dont do it in biceps/quads IMO
Some people do great with quad shots, for me, high mg/ml stuff is NO GO in the quad.