I Finished A Stem Cell Transplant For Myeloma 2.5 Months

I finished a stem cell transplant for myeloma 2.5 months ago. Not sure it has any relation to this, but I have an intermitten stinging sensation and some aching periodically in the back shoulder blade an inch or so in toward the spine and just above my arm pit. Been going on for several weeks. No associated rash in the area. Not sure who I should see about this, skin doc, neuro doc, GP??