myfriend has extreme itch

The medical theories are so very dull and mundane, but then reality is generally not so cool as fantasy. I am sorry you are not getting the sort of responses you seek on this site, but you are getting pragmatic and realistic answers. If this situation is really happening as you suggest then take the well meant responses to heart and get your friend to a physician so they may treat this. The itching is just a symptom, let the professionals find the cause.