Spider Bite Pictures

Classic photos of black widow, brown recluse, and more

1
Expanding Lesions From Spider Bites

An expanding lesion
Chad Warren

Before looking at pictures of spider bites from different types of spiders, know that many readers can easily make the mistake of seeing a picture on the internet and trying to diagnose their own injury or lesion from it. The problem is that many images are misidentified as spider bites by websites, patients, and doctors. They might be from spiders, but they can also be from other types of bugs or infections.

Generally, there are only two medically significant spider species in North America: the black widow and the ​brown recluse. Black widow bites, for example, are very difficult to diagnose by looking at the site of the bite, unless it includes fang marks (see below). Bottom line: without catching a spider in the act, there might not be an accurate diagnosis. Nevertheless, whether it's a spider or another kind of bug bite, treatment is generally the same.

What Kind of Spider Bite Causes an Expanding Lesion?

An expanding lesion, like the one in the picture, certainly could be a brown recluse bite, but there are so many other possibilities to consider. It really is impossible to determine what caused a blister or an abscess without seeking medical attention.

2
Bullseyes From Spider and Other Bug Bites

bullseye from spider bite
Jake from Atlanta

One of the things that set bites apart —whether from spiders or other bugs— from infections is the "bullseye" pattern of discoloration. It's common in tick bites, especially those that later turn into Lyme disease, and can also be present for spiders.

3
Black Widow Bite Fang Marks

black widow bite
Exodog

Black widows have fangs, almost like miniature snakes. Soon after a black widow spider bites you—before any reaction starts—you might be able to see two small holes like those in this image.

Black widow venom can cause muscle spasms and heart disturbances, but their bites don't typically cause the same sorts of wounds that are blamed on brown recluse spiders.

If you have a black widow spider bite, rest assured that they are rarely fatal. The most common symptoms after a bite (besides the pain of the bite itself) are:

  • Abdominal pain
  • Muscle cramps/soreness
  • Soreness and redness around the bite
  • Irritability/agitation

High blood pressure is also common from black widow spider bites, although it rarely causes any problems for the patient. Most of the symptoms are treated individually. An antivenin (spider poison antidote) is available for black widow spider venom, but it's not really necessary for most patients.

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Classic Brown Recluse Spider Bite

chilean recluse spider bite
CDC

Brown recluse bites can go unnoticed, or they can lead to severe pain 2 to 8 hours after the bite. In some cases, patients report feeling a "pinprick" at the site of the spider bite. In true cases of loxoscelism (medical terminology for the condition caused by brown recluse bites), skin tissue that develops could take several months to fully heal and the scars may remain. Generally, brown recluse bites are much less likely to cause significant injury than black widows. 

It's nearly impossible to say for sure if a spider bite comes from a brown recluse without the use of a lab test. However, there are some telltale signs that can be used to rule out the possibility of a brown recluse bite.

NOT RECLUSE is an acronym for the signs that a wound or lesion is not caused by a brown recluse bite. It stands for:

  • Numerous
  • Occurrence
  • Timing
  • Red center
  • Chronic
  • Large
  • Ulcerates too early
  • Swollen
  • Exudes moisture

The presence of any of these is an indicator that the wound isn't from a brown recluse. The presence of two or more of these signs almost guarantees that it's not. Let's take a look at each one.

5
N Stands for Numerous

Infected mosquito bites
T. Critchley

Multiple bites are not typically from spiders, especially not a brown recluse or black widow. In cases with so many bites, consider bugs that travel in groups, like mosquitos or chiggers, for example.

6
O Stands for Occurrence

Bites from spending time in the backyard
Bites from spending time in the backyard. Michele Bowden

In order to be a brown recluse bite, the way the bite happened is very important to the story. If the bite occurred because the patient disturbed a spider by moving old boxes in the attic, that's much more likely than getting a bite in the yard.

Recluse spiders have that name for a reason; they don't like crowds. They hide in really out of the way, dark places. Bad luck in the backyard, for example, could be due to poison ivy or spiders. It could also be a result of chiggers, which like to get into boots and socks to bite their prey.

7
T Stands for Timing

timing helps identify non-recluse bites
Julien from Washington, DC

If a bite doesn't happen from April to October, the chance that it's from a brown recluse are slim to none. Brown recluses are notoriously inactive during the rest of the year.

8
RE Stands for Red Center

Danielle from Binghamton, NY

A red, inflamed center is not an indicator of a brown recluse bite. Loxoscelism (brown recluse envenomation) is known for having a dark, flat center.

A swollen, hot area can easily be a staph infection. There is a possibility that it's a bug bite, but skin infections are even more likely. Lest you think that staph infections can be the result of a spider bite, it's probably not the case. At least one study found that spiders do not regularly carry bacterial infections.

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C Stands for Chronic

chronic bites help identify non-recluse spiders
Angela Phillips

If it takes a really long time for the lesion to heal, it might not be a brown recluse bite. They've got a reputation for lasting a while, but most brown recluse bites heal within three weeks and the biggest of them heal within three months.

A line drawn around the lesion, as shown in the picture, is a common method for keeping track of an expanding rash or area of swelling. Be sure to note the time and date when a line is drawn to know how fast the lesion expands.

10
L Stands for Large

tissue necrosis
Ivonne H.

Brown recluse bites are known for having necrosis (dead tissue) in the center of the lesion. However, the necrosis is not going to be bigger than 10 centimeters across (four inches).

A lot of infected sores are identified—even diagnosed—as spider bites. In truth, unless you have a spider to identify as the culprit, the odds are against a spider bite. It's much more likely that a non-spider bug did the biting in this case.

If the lesion grows or continues to get worse over a 24 hour period, it's worth taking a trip to see the doctor. If not, it's probably fine just to keep it clean and keep an eye on it.

11
U Stands for Ulceration

Nick from Alabama

A brown recluse bite will eventually break the skin (ulcerate), but if it happens before the week is out, it's probably not a brown recluse. Sometimes, it's not really obvious that the lesion ulcerated, other than the fact that it develops a crust.

So, if it's bleeding or crusty and it hasn't been a week, it's probably something other than a brown recluse bite.

12
S Stands for Swollen

Swollen eye from brown recluse spider bite
CDC

Swelling typically indicates something other than a brown recluse bite. Below the neck, brown recluse bites do not result in significant swelling. Above the neck is a different story. Bites on the eyelids and other very soft tissues of the face often swell after a recluse bite.

Any bug bite can lead to swelling from allergic reaction or envenomation.

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E Stands for Exuding

(c) Gary Goode

Brown recluse bites are known for being dry in the center. If it's oozing pus or moisture, it's very unlikely to be a brown recluse bite.

Sources:

Murphy, C., Hong, J., & Beuhler, M. (2011). Anaphylaxis with Latrodectus Antivenin Resulting in Cardiac Arrest. Journal Of Medical Toxicology7(4), 317-321. doi:10.1007/s13181-011-0183-1

Rader, R., Stoecker, W., Malters, J., Marr, M., & Dyer, J. (2012). Seasonality of brown recluse populations is reflected by numbers of brown recluse envenomations. Toxicon60(1), 1-3. doi:10.1016/j.toxicon.2012.03.012

Vetter RS1, Swanson DL2, Weinstein SA3, White J3. Do spiders vector bacteria during bites? The evidence indicates otherwise. Toxicon. 2015 Jan;93:171-4. doi: 10.1016/j.toxicon.2014.11.229. Epub 2014 Nov 21.

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