Polymyositis & Dermatomyositis Support Group
Polymyositis (PM) is a type of chronic inflammation of the muscles (inflammatory myopathy) related to dermatomyositis and inclusion body myositis. The inflammation is predominantly of the endomysium in polymyositis, whereas dermatomyositis is characterized by primarily perimysial inflammation.
Another thing I suggest is to ask your doctor for a topical pain reliever, sometimes I have had to do this for spots I have itched to much, and it really works.
I hope these things work for you as well as they did for me! Good luck.