Tough breaks ..
Yes, spider bites can be very nasty (locally) while they heal.
It would seem that such a small insect couldn't do much harm, and the bites are very,very seldom fatal, but they are very damaging in that region around the wound.
The initial infection was about 5" by 7", by the next day it had tripled in size, then that was doubled on the fourth day. I would say it was nasty allright. The bite itself was nothing, the infection was pretty awful.