Probably an MD. This is a mainstream treatment. My understanding is that it's used to deal with necrotic flesh caused by antibiotic-resistant bacteria. (I could easily be wrong; I heard about this via my wife, who is a hospital chaplain.)
I'm a doctor in the UK. We used them for vascular patients with poor wound healing/ulcers.
Wow, I was totally unaware this method is used in developed western medicine.
It's also described in the US army field survival manual