It’s been 5 weeks since my surgery and so far things seem to be going fine. Last year I had my right knee replaced so I’m pretty familiar with what to expect. I’m noticing severe stinging on my incision directly over the knee cap. It just started today and makes it really difficult to do my PT at home today. The incision itself looks great. It’s a little warm as normal and smoothing out. It didn’t really start hurting until I did the scar rubbing I was instructed to do? What could be causing this all of a sudden?