I'm posting this question on behalf of a friend of mine: How do you get rid of an itch that always occurs in one single spot every time?

She has a place on her back that itches constantly--no lotions, moisturizers, or anything can make it go away! She's constantly itching there. Upon inspecting the itchy spot, the sKin looks perfectly normal. no bumps, red spots, bug bites, rashes, etc. But it drives her nuts--sometimes i catch her scratching it 5 or more times a day. She's miserable! What might be the cause of her chronic itch? Any suggestions for treatment?