I cannot pretend to be your internist, but, as WYDave stated, this is not a typical histamine related "hives". The persistence and progression of your rash is concerning, and may or may not be urticaria (hard to tell from you description).
Please, find a doc you can afford, he needs to looks at your back. He needs to access qualities of your rash and its history to better develop a diagnosis. It may or may not be a serious condition and you cannot rely on us to make that decision. From this doc's perspective, your rash warrants investigation.
Edited by badger@uw 3/27/2009 13:30
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