Notalgia paraesthetica is a condition where an itch and/or changed sensation arise in the areas of skin just below the shoulder blade on either side of the back. The nerves, which supply sensation to the upper back, can result in altered sensations (such as the itching). http://dermnetnz.org/systemic/notalgia-paraesthetica.html
M.D. said this is typical of most kinds of neuropathic pain.