Unless you have excess swelling in specific parts of the body, like a cranial bleed, which does require letting out some blood to relieve pressure that can kill you. And leeches are used medically for relieving some types of swelling as well. Then there is maggots that can be used for infections to eat dead skin. All of those practices came from some specific medical treatments that did work for some specific types of injuries, although a few of them were overused for things that had nothing to do with why they existed in the first place which was counterproductive.

So while not asking for it is good advice, don't turn it down if an actual licensed medical doctor recommends them as a treatment that has been supported by evidence.