injection problems

I have been injecting fina for the last 3 weeks. I decided to give my butt a break and proceeded to inject into my legs. My first injection made my leg sore, but my second in my other leg has caused major inflation around my knee and extreme soreness. Is this typical? Or could this be serious?

At the knee? Where did you inject?

Make sure after you inject to rub the f*** out of the injection spot throughout the day and that should help.