Testosterone injection bad pain in leg?

I did an injection of testosterone in my lateral head of my quad 7 days ago and my leg is still in massive pain and I can’t bend it. This is not the first time I’ve hit this spot so I’m not sure what’s causing my leg to be so stiff and painful.

I know how to inject properly so that’s not the issue. I did notice my muscle tensed a bit when I inserted the needle but I continued to inject the fluid in. No blood in the syringe nor any when I pulled out. This is the same testosterone I’ve been using since July of 2017. I’ve never had post injection pain last this long and I’m a bit worried.

Any suggestions would be helpful.. this sucks because I can’t bend it past maybe 120 degrees.

I’m very lean and used a 25G 1” needle and warmed the liquid up too.