After my first injection, my butt swelled up and turned red around where the injection was. Its been hard to walk since its swelled so bad, has this happened to anyone else? Its been 4 days and i'm still limping around a little bit. It might be because the first time it happened I flinched a little bit and flexed when it first went in, then relaxed, but I don't know. Any type of feedback on why its swollen so bad would be nice, thank you.