Hello, could be some hidden infection, if you still have the lump, then I would certainly see your doctor or go to an ER.
Hope you feel better soon.
Hi Micro....perhaps ur body is trying to fight off sone kind of internal infection. Have you been on antibiotics recently, infected tooth, getting a cold? Could it be a swollen lymph, the neck has approx 31 of them in the neck area. Best bet is just go to the emergency..seems to be a long time since you've had it. Good luck
Peace
Deb
Maybe a cyst / nodule A thyroid scan would check for this. Also a carotid
doppler to check the blood flow through arteries in the neck.
Follow up with your Dr.