Example being poking a zit on the side of your face and then causing an itchy feeling on the back of your neck
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Anesthesiologist here, if I’m understanding your question correctly, you may be talking about “referred pain”. It more often happens with sensation associated with your organs (as opposed to muscle or skin where you can easily localize where that sensation is). This is why heart attacks can be perceived as pain to the left arm/jaw. Or why GI issues can feel like vague pain that moved around. The reason this happens is bc of the way these nerves are wired.
Edit: I realize I missed your example lol. I don’t think I can explain why poking a zit can cause back itchiness. Maybe a neurologist colleague out there can explain that 😂
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