Discussion: Leeches are another effective detoxification technique, especially in areas of the body with external inflammation..

Medical leeches are an ancient method of treatment that has even received support from the medical establishment. The leeches release potent anticoagulant enzymes, and when combined with the suction of the contaminated blood around the inflammation, the action stimulates blood circulation and lymph to the affected area and thus aids recovery.

Link: Chinese Medicine: Cupping, Scraping, Ginger therapy, and medicinal Leeches.
https://www.sf-healing.com/page/137 (Copy & Paste)