What Causes Night Sweats And Rashes On Her Neck And Legs?

wife has Ana indicate speckled pattern and 1:160 tier, night sweats, rash on her back and legs, lost weight while eating more and junk food on top of that. 10 year ago she had Hodgkin's Lymphoma. 6 5/8 mass in her chest. Chemo was ABVD and raditiion aswell. Right now her neck feels tight and she has a lump below her left collar bone. Blood work came back no cancer in the blood. Her P was tested for liver and kindney function and thats good. Is this something we just have to wait until we see the Dr? Can Hodgkin's Lymphoma come back and not show up in the blood test? To her and l it feels like we are about to go through the same hell we did 10 years ago. My wife Laura is an ER RN. Thank you for your time Troy