hello, have had swollen lymph nodes in both arms, groin and one armpit for at least 3 weeks now. went to my doctor who drew up some blood work, but blood work shows no sign of infection, or autoimmune disorders. also cell counts look good. the nodes are tender to the touch and can be moved around. no other symptoms, no fever or weight loss or anything out of the ordinary for me. any ideas what could cause this? thank you