<s>[INST] Hi, I recently noticed my right lymph node in my armpit has been swollen, I went to the doctor on thursday and he prescribed Naproxen. Tomorrow will be the last day I have to take the medicine and I havent noticed a difference, and I got a fever today. What could it be? [/INST] Hi... Thanks for asking Chat Doctor .... Swollen lymph nodes in armpit may be caused by.-Bacterial or viral infections-small skin cuts in hands or fingers-Allergic inflammation-Rarely some cancerous Naproxen can suppress allergic inflammation but as you are now having fever also. It seems you are having infection. So you need to add an antibiotic along with naproxen... Also check whether you have any small cuts on fingers or hands. If you have any take care of them by applying antibiotic creams to them. Hope my answer helps... </s>