Ok on wednesday i injected 1/2cc of tren enantate in my left bicep using a 25gage 5/8 pin. It imediately hurt like hell and is still painful to flex. Today i injected the same amount, same way and the same spot but on my right arm and no pain what so ever???? The reason i injected in the other arm is because the first one is swollen and i wanted to even them out. I use good hygiene practises when injecting so what did i do wrong with the first bicep injection???why the **** does it hurt????