Garra Rufa, a type of small tropical fish, also nicknamed Chinchin Yu, nibble fish or simply doctor fish, are put in hot springs. As they can live and swim freely in at least 43-degree-hot waters, they are naturally used for the treatment of skin diseases in such spas. When placed in the spa, these fish can feed themselves on the dead cells of the human body, since they only consume such cells, leaving the healthy skin of the human body to grow. The whole process is reportedly free of pain. It won't hurt and the bather might feel a pleasant tingling on his or her skin.
IF, as I do, You think thats rather gross, then lets not foreget maggot debridement therapy (MDT), In maggot therapy, disinfected fly larvae are applied to the wound for 2 days within special dressings to keep them from migrating. Maggots used in maggot therapy are highly selective about what they consume i.e. they focus exclusively on dead tissue and will not eat living flesh. The medical literature identifies three primary actions of medicinal maggots on wounds: they clean the wounds by dissolving dead and infected tissue ("debridement"); they disinfect the wound (kill bacteria); and they speed the rate of healing. Maggots never reproduce in the wound. Larvae of all species are immature, and can not reproduce.