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Leeches can be used to reduce swelling
Former Manchester United, Newcastle United and French international player, Loius Saha.
After suffering from chronic knee pain and inflammation, used Leeches to reduce the swelling on his knees.
After the treatment, the 32 year-old Saha said he felt as though he had “the legs and hunger of a 20-year old”.
The use of leeches for therapy has been described from 1000B.C., in India. When a leech bites, it releases anaesthetic and anti-coagulant serum, which prevents blood clotting. The active constituent that is secreted from the saliva of the leeches is known as hirudin, which is an anti-coagulant and can be used to treat inflammation. However, when leeches are used for medicinal purposes, it is important that they are allowed to become full and release on their own. Forcibly removing them can cause the leech to regurgitate bacteria into the wound.
https://blogs.unimelb.edu.au/sciencecommunication/2012/09/20/the-weird-world-of-sports-injury-treatments/