hirudotherapy. medical leeches in a glass in water

aid alternative ancient animal annelid biology bleeding blood bloodsucker bloodsucking care cholesterol closed collagenase complementary dangerous detail disgust doctor fringe glass healing health hermaphrodite hirudotherapy hospital invertebrate jar leech leeching lytic medical medicinal medicine nature paraphyletic parasite peptidase purify relief science skin spa specimen sucker therapy treatment water wet worm