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Why does My Arm tingle, then itches extremely, has no rash

This has gone on periodically over the years and I haven't found a common denominator. My arm, around the elbow area and sometimes on the tops  of shoulders and upper arm, will tingle then starts to itch that will become so severe that I scratch uncontrollable enough to cause bruising. It can last for hours or all day or night. There is NO rash. It does not seem to be stress.
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