Hahaha. Seriously, it's been biopsied and they found nothing. And, I sleep with him and I got nothing.
That last sentence may be a bit misleading:)
You had mentioned some allergies. Sometimes non-traditional medicines can be helpful in these instances. I know of cases where it was a particular food that set off itching. If you live near a metropolitan area, it might be worthwhile to consult with an osteopath or even a naturopath and see if they can uncover something.