Most exposures to black widow spider venom are accidental, but in a rare medical case, the exposure was intentional.

Black widow spiders also use their webs to ensnare ... To feed, black widows puncture their insect prey with their fangs and administer digestive enzymes to the corpses. By using these enzymes ...

one of only two common poisonous taxonomic ranks of the insect in North America, along with the brown recluse (Loxosceles). Alaska is the only state that doesn't have a type of black widow spider.

So, is your bug bite is actually a spider bite ... to help you identify what you're dealing with. Brown recluse and black widow spiders are venomous spiders Black widow and brown recluse spiders ...