Two weeks ago, we saw this on Adams leg. Rob and I thought it was a spider bite. It then turned into a painful boil which took over a week to heal. We now have a spider book and I think it that he was bitten by a sac spider as it says they are responsible for 75% of recorded spider bites in Gauteng. Yes, we live in the Cape, but these spiders are found through out SA, and the symptoms are exactly as the book says.
I am teaching the kids to not drop their clothes and towels on the floor, especially outside when they go swimming. We have loads of spiders here and I hope that this is the first and last bite.