Did a bicep shot with tren ace. Im running 50mg ed. I started to get some scar tissue in the glutes so i switched it up. I read on some forums and people said if ur lean enpugh you can use a long enough slin pin for the shot. This is the first time i have ever pinned biceps. After the shot it felt so painful every time i contracted my arm. It also made my bicep look smaller and deflated. Today its still sore and hurts to touch but its getting better. Is this normal? For my bicep to retract a bit? Never seen this before. I know i hit the muscle and i aspirated.