Thank you for your question.
There is no doctor in the world who would treat gangrene
with medications. Gangrene would require surgery and this is something that is agreed worldwide.
If gangrene is not treated in time it may lead to life threatening infections.
Therefore I would recommend that you should have surgery of to cure your gangrene rather than trying to avoid surgery for this.
I know this is a tough decision and I would have felt the same way that you are feeling but the fact is that gangrene does require surgery.