Thanks for writing to the forum!
“When I raise my arms the redness goes away. When I lower my arms the redness comes back.” This is characteristic of thoracic outlet syndrome. You can read more about this on : http://www.ninds.nih.gov/disorders/thoracic/thoracic.htm
Generally physiotherapy is enough to treat this problem.
I think you should discuss this possibility with your doctor. It is difficult to comment beyond this without examining.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
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