I badly sliced open my finger like a prat, and like a prat had it stitched up by a local guy who blatantly wasn't a real doctor.

Fortunately, I'd planned to leave the island the next day. 2 days later it felt funny so I removed the bandages and saw my finger was turning black and it stank.

Again fortunately, the island I'd travelled to was larger and had a proper clinic on it. Had it dealt with there and then had to travel to a city where I had daily appointments for a month where they prodded around and poured hydrogen peroxide on it.

So tl/dr I was an idiot and got lucky. About the only thing I did right was remove the bandages against instructions of a "do it yourself" healer guy.