It could be contact dermatitis or an allergic reaction. Did that arm come in contact with anything different before the itching started?
It could be an irritated nerve. Irritated or impinged nerves don't always cause pain. Sometimes they can manifest as an itch or a burn.
I would think it is allergies! I was like that when I had seasonal allergies and also allergies to pets. Try a histamine like Aerius. Takes a few days to work into your system.
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