Hirudo medicinalis (a European medicinal leech) was earlier used in Leech Therapy ( classified as Blood Letting). Leech Therapy was used for the removal of blood from a patient body. The first description of Leech Therapy was found in the text of Sushruta Samhita, written by Sushruta in 800 B.C. who was also considered “the father of plastic surgery”. Diseases, where leech therapy was indicated, were skin diseases, sciatica, and musculoskeletal pains.