i had this severe itching and i also had some eruptions on my right arm only. i figured it for shingles. i still have the outbreak but not the itching. my itching was relieved by topical colloidal silver, baking soda, and hydrogen peroxide. this list is in order of how well each worked from best to least.
i wish you could find what is causing it. virus? megellons? i even suspected mercury or parasites erupting through the skin.