Could be a reaction to the knee surgery. Have they checked it to make sure its not gotten infected. I think with a "wound" to the area they can swell too. That is what I read about swollen lymph nodes recently. And trust me, I have read a lot about swollen lymph nodes lately lol. I have them under my arm, in my shoulder, and behind my knees. But I have Lupus. Hope you better soon.
I had knee surgery 3 weeks prior to this occurring as well, maybe this might have something to do with it?
Indeed. Not only that. lymph node swelling is a symptom of all major infections usually. I had the ones in my neck, under my arms, and in my groin swollen badly for the duration of my staph infection. Perfectly fine now (except for the 40 ulcers scars that is.)
It would be a lot more likely to be something else too, since the swelling increases reather than comes suddenly. And certainly no reason for the lumps in the legs!
With HIV you have generalized lymph swelling. Not just in one area. But I would get tested none the less considering you are concerned about STI's. I would have them test for Syphilis too because that IS one of the symptoms of that particular infection. And only one antibiotic can treat syphilis. I am surprised they did not offer that one right from the start.
Just hope it isnt HIV as that is indeed one of the symptoms