What is the ruling on a woman exposing herself to men for the purpose of treatment?

The questioner : I have a question that I would like explained orally. If you would permit me, Your Eminence the Shaykh, because it is a long question. A woman exposing herself to men for the purpose of treatment.

The Shaykh : Yes, it is permissible for a woman if there is no male doctor available to treat her. Is it permissible for a woman to treat a man, and not for a man to treat a woman?