Spider Bites: What You Need to Know
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Are They Poisonous?
Spiders are blamed for all kinds of things
that turn out to be skin infections or some other bug’s fault. Most don’t even
have fangs long enough to break your skin. When they do bite, they're typically
harmless. In the U.S., only the black widow and brown recluse have venom strong
enough to really hurt you. And their bites are rarely deadly to humans.
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What Do Bites Look Like?
They’re pretty much just like an insect bite.
For the most part, you can’t tell a spider bit you just from your
symptoms. You’ll get a little bump on your skin. It might get red, itchy, and
swell up a bit. It might hurt, but no more than a bee sting and usually not for
more than an hour or so. That’s basically it -- unless you're bitten by a
venomous spider.
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Black Widows
This spider’s telltale sign is the red
hourglass shape on the bottom of its big, round abdomen -- the back part of the
body. Black widows are shiny and black and about half an inch long. You can
find them anywhere in North America, but mostly they’re in the southern and
western areas in the U.S. They like quiet, out-of-the-way places like closets,
sheds, garages, and woodpiles.
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What’s a Black Widow Bite Like?
The bite feels like a pinprick, so you may not
notice it. The first signs might be small, red marks with some swelling. Within
an hour, it’ll hurt a little more, and the pain might spread to your back,
belly, and chest. You might have stomach cramps, and your belly might feel a
little stiff. You may also sweat a lot. In serious cases, you can have trouble
breathing, along with a fast heart rate, nausea, and vomiting. The area around
the bite may continue to get redder and more swollen.
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Brown Recluse
People sometimes say to look for the small
violin shape on the part of the body where the legs attach, but that’s easy to
get wrong. Check the eyes instead. Most spiders have eight eyes in two rows of
four. Here, look for six eyes: two in front, and two on each side. They live
mostly in the southern Midwest and parts of the South. They like to stay
indoors, tucked away deep in the stuff in your basement or attic.
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What’s a Brown Recluse Bite Like?
You might feel a little sting at first, but
it’ll hurt more over the next 8 hours. You also might see a small white blister
that has a red ring around it, like a bullseye. Sometimes, the skin in the
middle of the bite can turn blue or purple, and you may have an open sore that
gets bigger for up to 10 days. It doesn’t happen often, but some people also
have other symptoms like fever, chills, rash, and an upset stomach.
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Tarantulas
Their big, hairy look is much worse than their
bite. At least this is true for the ones in the U.S., where you find them
mostly in the Southwest. Make no mistake, their bite hurts, sometimes for up to
a week. It might also get red and warm, but that’s the worst of it. Some types
of tarantulas can also flick fine barbed hairs from their belly at you. If
these stick in your skin, they can cause itching, swelling, and irritation.
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False Black Widow
These look a lot like black widows, but they
don’t have the red hourglass. And their color ranges from purplish-brown to
black. They like to cozy up in homes along the Atlantic, Gulf, and Pacific
coasts. Pain from their bite can get worse in the first hour and you may get
some blisters around it. It might make you feel generally sick with a headache
or an upset stomach, but this will pass within a few days.
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Hobo Spider
At one point, these were thought to be really
dangerous, like the brown recluse. But the past 15 years of research says
they’re mostly harmless. You won’t get much more than some redness and mild
pain, and maybe some swelling. They’re found in the Pacific Northwest, usually
in places like woodpiles and retaining walls. They often have a light stripe
running down the middle of their bodies.
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What to Do
The first steps are the same for all spider
bites, even those from a black widow or brown recluse. Clean the area with soap
and water and put on some antibiotic cream. Then take a cloth and wet it with
cold water or wrap it around some ice and put that on the bite. If you were
bitten on your arm or leg, raise it up. You can take acetaminophen or ibuprofen
for pain and an antihistamine for swelling.
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When to See a Doctor
Get checked out right away if you have
symptoms beyond the bite, like serious pain in your belly, cramps, throwing up,
or trouble breathing. You also should see your doctor if you have an open sore
or a bullseye mark, or if the bite gets worse after 24 hours. Look out for
things like pain around the bite getting worse, redness that’s spreading, and
fluid coming from the bite. If you can do it safely, take the spider with you,
even if it’s dead.
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Treatment for Black Widow Bites
You may get prescription drugs to ease the
pain and relax your muscles. There’s an antivenom for black widows, but it’s
rarely used because some people have a serious reaction to it. And it’s almost
never really needed. It’s saved for more serious bites in the very young, very
old, or people who have other health issues.
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Treatment for Brown Recluse Bites
This is mostly about managing the wound so it
doesn’t get infected. If you have a bump and redness, your doctor might
recommend antihistamines or a cream to help with swelling and itchiness. For an
open sore, you need to clean it daily and use antibiotic cream. From there, you
should keep an eye on things, especially for symptoms beyond the bite, like
fever or chills.
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Allergic Reactions
It’s not very common, but just like with bee
stings, some people are allergic to spider bites. Watch for swelling in your
face or mouth, trouble talking or swallowing, tightness in your chest, or
trouble breathing. If you feel any of these symptoms or see them in someone
you’re with, get help right away.
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How to Prevent a Spider Bite
If you’re poking around in woodpiles, sheds,
attics, and other areas, wear long sleeves and a hat, and tuck your
pants into your socks. Make sure to shake out work gloves, boots, and
clothes you haven’t used in a while, because spiders can hide in them, too. And
don’t keep rocks, lumber, or firewood near your house. Inside, don’t put your
bed directly against the wall, and don’t store things under it.
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