I have a lump size swelling on my knee also. It started off pretty small but has become a lot bigger. My knee also creaks and my movement has decreased a lot (I can't bend my knee much now). My PTs think I may have a condition called Femoral Patella, though I would obviously need to see a doctor to diagnose it. I have been given a break from PT to see if that helps any but it hasn't so far.

I would go and see your doctor if I was you, just to rule out any other possibilities. Don't always assume that everything is always RSD without ruling out anything else - I know most of the time it turns out to be RSD unfortunately but the first time you don't go and get something checked out, it will probably be something that can be easily fixed!

I hope you start feeling better and get some answers real soon! You are in my thoughts and please keep us posted.