Swollen lymph nodes behind knee/minor knee and ankle swelling as well, but no scratches/bites. should i be concerned?

You should: You should let your doctor evaluate this problem to see if it is serious.

Unusual: I can feel, aneurysms, baker's cysts and some tumors, but I do not think that i, have felt nodes in the popliteal space. Be sure, see a doc.

Yes: The lymphatic system removes old proteins from the body and when the lymphs are swollen they cause congestion and back up within the system. The result is swelling see your primary care doctor for advice and treatment.

Monitoring Centers: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.