Doctor fish is the name given to two species of fish: Garra rufa and Cyprinion macrostomus. Other nicknames include nibble fish, kangal fish, and doctorfishen; in non-medical contexts, Garra rufa is called the reddish log sucker. They live and breed in the outdoor pools of some Turkish spas, where they feed on the skin of patients with psoriasis. The fish are like combfishes in that they only consume the affected and dead areas of the skin, leaving the healthy skin to grow, with the outdoor location of the treatment bringing beneficial effects.
http://en.wikipedia.org/wiki/Doctor_fish
http://en.wikipedia.org/wiki/Doctor_fish
Just heard about this while checking out spa treatments in Mumbai. Apparently the Fish Pedicure [a whopping $140 in the US but a measly Rs 500-1000 in Mumbai] is a popular spa choice!
