I'm aware that this could sound a bit bonkers, but I'm curious... Does anyone ever have an itch that they can't locate, or (not sure whether this is related) one that seems to move around?
This only happens occasionally and the moving around version occurs most often at night.
I'm pretty sure it's not an allergy as once I've located and scratched the source of the itch it just goes away, and there's no evidence of any dermatological distress.