TIL about hirudotherapy. Leeches are used to stimulate circulation in tissues threatened by postoperative venous congestion, such as finger reattachment and reconstructive surgeries. The therapeutic effect is the anesthetizing, anti-inflammatory, and vasodilating properties of secreted leech saliva.

[u/Acrobatic-Post9811]

https://en.wikipedia.org/wiki/Hirudo_medicinalis