Hobo spiders, wolf spiders, house spiders, and the bites of other domestic types do not contain venoms that are of medical importance to humans, Vetter says. Other symptoms can include everything from headaches, muscle weakness, and difficulty breathing, to seizures, numbness, and painful muscle cramps. Although that pain starts around the bite site, within an hour, it often spreads to the chest or abdomen, depending on whether the bite occurred on the victim’s upper or lower body. “But most of the reaction will be on the inside,” Vetter says.īlack widow bites contain potentially deadly amounts of venom and tend to be painful right away. (2)īlack widow bites can in some cases cause skin lesions, ranging from small red marks to angry, red, streaky skin patches that are inflamed or contain pus. ( 4) The Centers for Disease Control and Prevention (CDC) notes that while venomous spiders are dangerous, they aren’t usually aggressive. The reality is that the brown recluse spider is limited in its geographic range: It’s found in the central and southern United States. ( 3) The brown recluse’s bite is poisonous and can result in coma, kidney failure, or even death.īecause of the severe reaction a brown recluse bite can trigger, these spiders are likely blamed for more harm than they actually cause. Along with a wide variety of skin symptoms, brown recluse bites can cause chills, fever, nausea, and other flu-like symptoms common to infections. ![]() ![]() “Its bite causes the collapse of the capillary bed” - also known as skin necrosis ( 2) - “so people who are obese and have poor support of the capillary cells may have a more massive reaction,” he explains. ( 1) But when it comes to venomous spider bites, there are characteristic signs and symptoms.īrown recluse bites sting, and they can resemble anything from small blisters to large, rotting-flesh sores, Vetter says. How to Identify Which Spider Bit Youīroadly speaking, a spider’s bite tends to resemble a bee sting: a sharp prick of pain is followed by a red, inflamed skin lump that may hurt or itch but that goes away after a few days. His point: Black widow and brown recluse bites are so different that they could never be mistaken for one another.īut when it comes to common household spiders, hobo spiders, and other domestic varieties, a spider’s bite has some predictable characteristics. “I’ve had patients contact me saying, ‘This mark on my leg was either from a widow or a recluse,’ but that’s like saying you either got stabbed or trampled to death,” he says. Even if you’re talking about just one type of spider - say, the brown recluse - its bite could cause a range of reactions, “everything from a little pimple-like bump to a rotting-flesh lesion,” he says.Īt the same time, Vetter allows that different types of spider bites do produce distinct reactions. Spider Bites Can Look Very Differentĭifferent types of spider bites may provoke different reactions in different people, he says. “There’s no one true spider bite,” Vetter says. RELATED: Everything You Need to Know About Bug Bites and Related DiseasesĪ lot of things. ![]() ![]() That said, some spiders do bite people, and the result can be ugly. So the first thing every spider expert in America would like people to know about spider bites is that they’re uncommon and often misdiagnosed. “Spider bite is a catchall grouping whenever there’s a severe skin infection they’re all lumped in as spider bites,” he says. He explains that most “spider bites” are more likely mosquito bites that were scratched and became infected. “ Spider bites are really rare,” says Jonathan Day, PhD, a professor emeritus of medical entomology at the University of Florida. Other researchers back Vetter up on this. But most of the skin issues people pin on spiders are actually other types of bug bites or skin issues, he says. “People wake up in the morning and find a red mark, and immediately call it a spider bite,” says Rick Vetter, a retired staff research associate and entomologist at the University of California, Riverside. You spot an angry-looking red welt on your leg, and it seems too big to be a mosquito bite.
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