I also have something on the right side of my upper back which has been there 2+ years and cannot be killed by anything I've tried so far (which is about everything).
Last night I actually felt them moving out to a new location. They haven't changed locations in 2 years. I have been taking 1000 mg nitazoxanide twice a day for the last 3 days.
I have been thinking they may be protected by a biofilm, but I don't know if biofilms are possible on the skin.
I have recently become aware that the vertebrae in the area between my shoulders is sore to touch. Perhaps they are in my spinal column. Needless to say, I'm a little nervous about this prospect.