### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hello. So this is an issue that requires a lot of background info, so here we go. In January of 2013, I had a mysterious and large mass appear on the right side of my neck. There were two parts to the mass, one solid and one filled with pus. No known cause, but whenever I had a needle biopsy done there was nothing coming out of the solid half of the mass so there were never any conclusive results. I had a CT scan done and there was another mass found on the outside of my lungs, but this one was benign. ENT surgically removed the neck-mass and the mass in chest was overlooked due to benign status. So, fast forward to January of 2014, I had to get a follow-up CT scan on the chest mass, and when I got the results a month later I was told that it was now about half the size than it was a year sooner (Good news!). In April, two lumps appeared on the back of my neck, one on the back right side and the other on the back left side. Along with this, there was a bit of swelling on the outer side of my right arm. I was given some antibiotics and sent home. The two lumps on the back of my neck are still there and very solid, but never hurt. The swelling on my right arm has never gone away, and it sometimes has small bursts of pain but nothing to stop me from any regular activity. Finally, recently, there has been some swelling on the left side of my neck, but it isn t similar to the lump I had on the right side of my neck. This swelling seems like soft tissue. Any idea what this may be? During the multiple biopsies and tests the hospital I was with had ran, there were zero signs of tuberculosis and lymphoma. An infectious disease specialist said that it may have been kikuchi disease, but there were no tests to run for it so it was only a theory. I didn t think it would be kiuchi, because I had fit none of the symptoms. If you re able to help, I would truly appreciate it. Thank you.

### output:

Hi, as per your history, Kikuchi-Fujimotos disease is the best possibility in your case and biopsy is the confirmatory test in such cases! Sorry that sometimes all symptoms might not fit due to partial therapy! There is no other specific tests available; However, it could be some acute lympadenitis or toxoplasmosis also! Kikuchis disease just needs NSAIDs group of Chat Doctor. Wish you good health!