Bloodletting or Raktamokshana is also done using blood sucking acquatic worms of the class Hirudinea. By way of preparation, the area where the leech is to bite must be cleaned and dried. After a drop of milk is applied to the affected area or a small cut made there, the leech is placed on it. 

The milk or blood induces the leech to bite into the flesh and suck out blood from the diseased part. After a sufficient quantity of unclean blood has been drained out, the wound is washed with cold water and bandaged after applying herbs or medicines.