Black Widows are primarily neurotoxic. They don't cause a lot of hemolytic tissue damage at first and so the bite itself might not be noticable and the bite wo

Black Widows are primarily neurotoxic. They don't cause a lot of hemolytic tissue damage at first and so the bite itself might not be noticable and the bite wound might just look like mosquito bites. And the onset of the venom takes hours. So you might not know you've been bitten until hours later when you go from flulike symptoms to freaking full on insane pain all over. And then all of your organs fail. So a major complication of venomous bites is that your window to get to a medical facility can be notably decreased.