I have heard some people saying that spot injections dont work, that if they did all injectors of steroids would have big butts since many pin there. I pin in my right theigh because its easier and i have noticed it becoming bigger than my left. If my experience is normal can i pin in my left pec to make it bigger and does it hurt more than the theigh? What size needle should i use. For my theigh i use 1" long.