I seem to have stumbled across the middle of this thread.
I was once bitten by one of these bad boys. Didn't know what had caused it at the time, but my hand swelled up and began turning black from necrosis (I think that's the correct term for it).
It took several days for it to turn the corner, but my immune system won in the end. It was a *****, though! I had a huge hole in the back of my hand immediately after it broke open. Pretty gross I still have a scar from it 30 years later.