I recently was bitten several times by a spider or spiders during an outing in southern Virginia, USA. The bites looked really nasty for a couple of days, but are now subsiding and have stopped itching, so I am not worried.
A friend told me that a spider laid her eggs in the arm of one of his friends, and that eventually tiny spiders emerged from the swelling, and a doctor had to cut the wound open, deliver the rest of the spiders, and clean it.
This person is not prone to exaggeration, but I am asking if this is characteristic of one or several species, or not uncommon among all spiders.