What Could Swelling In Neck And Face Post Brain Stimulation Surgery Indicate?

I am experiencing an intermittent swelling sensation on the left side of my neck and face. it is a sensation similar to the swelling of a blood pressure cuff on your arm in that it swells slowly appearing to give off heat and then relaxes like a bl;ood pressure test. I recently had deep brain stimulation surgery on the right side of my brain and am unsure whether the events are related. it happens eight to ten times daily and has increasingly resulted in a sore/stiff neck. I also have a thyroid condition and take synthroid and did know know if that were related