Awaiting expert review. This page covers safety or regulatory rules that change over time. It is kept out of search results until a qualified reviewer has checked it; the sources below are dated so you can verify each point.
Quick answer
A brown recluse spider is a shy, tan to brown spider, Loxosceles reclusa, with six eyes in three pairs, native to the south-central and midwestern United States, whose bite can sometimes damage skin.
It hides in dark, dry, cluttered places by day and hunts insects at night. Bites are uncommon even in heavily infested homes, and most heal without lasting harm.
Quick facts
The key facts about Brown Recluse Spider, with sources:
- Scientific name
- Loxosceles reclusa, family Sicariidae 1
- Body length
- Males 7–9 mm, females 8–12 mm, not counting legs 4
- Native range
- Established in 16 states, from Nebraska and Ohio south to Texas and Georgia 3
- Eggs
- 20–50 eggs per round sac, two to five sacs in a lifetime 3
- Life span
- About 1 year to mature; 2–4 years on average 1
- Bite outcome
- About 90% cause no reaction or a small red bump; about 10% damage skin 3
Key takeaways
- The surest way to spot a recluse is its six eyes in three pairs, not the violin mark on its back.
- Brown recluses live in a fixed band of central and southern states and are very rare outside it.
- Where they live, they can be common indoors, yet confirmed bites are uncommon.
- Most bites heal on their own, but a spreading wound or feeling ill needs a doctor right away.
- Control rests on cutting clutter, sealing gaps and trapping, with treatment by a licensed company for large numbers.
What a brown recluse is and why doctors watch for it
The brown recluse is a medium-sized spider with long, thin legs and a plain brown or tan body.
People also call it the fiddleback or violin spider, after a dark mark on the front half of its body 1.
It is one of only two spider groups in the southern U.S. that doctors treat as medically important, the other being widow spiders 4.
In science terms, it belongs to the genus Loxosceles, in the family Sicariidae. Eleven recluse species are native to the U.S., and four are known to harm people 3. “Brown recluse” is the proper name for only one of them, Loxosceles reclusa 1.
The name fits its habits: it hides by day and runs from threats, and its fangs are very small and suited to subduing insects 4. Bites mostly happen when the spider is pressed against skin, such as inside a shoe or under a sleeping person 3.
The violin mark is not proof
UC IPM says the violin mark varies, can fade and is faint or missing on some recluse species. Many harmless spiders have dark marks that people read as violins. Count the eyes instead 1.
How a brown recluse lives, day to night
A recluse follows the same routine most of its life, and that routine explains where people meet one.
- Rest in a retreat. By day it sits in a loose silk retreat in a dark crack, box or pile. Its web is a thin, messy sheet that acts as a trip wire for passing prey 14.
- Hunt at night. After dark it leaves the retreat to look for insects, and males roam more because they also search for mates 4.
- Shelter at dawn. As morning comes, a wandering spider may crawl into clothes, shoes or bedding left on the floor 1.
- Breed in summer. After mating in June or July, the female lays 20 to 50 eggs in a round silk sac 3. The eggs hatch in a few weeks, depending on heat 4.
- Grow slowly. Young spiders molt several times and take about a year to mature. Adults average 2 to 4 years, and some lived more than 7 years in the lab 1.
- MatingJune or July
- Egg sac20–50 eggs in a round silk case
- HatchA few weeks later, faster when warm
- SpiderlingsSeveral molts, about 1 year to mature
- AdultAverage 2–4 years; up to 5 egg sacs
- Back to step 1
Shed skins look “splayed out” and ghostly, which is a useful clue during an inspection. Source: [3] [4] [1]
Recluses can also live 6 to 12 months without food 1. A closed-up cabin or storage shed can still hold live spiders after a long, empty winter.
Recluse relatives and the spiders mistaken for them
| Spider | Eyes | How to tell it apart |
|---|---|---|
| Brown recluse (Loxosceles reclusa) | 6, in three pairs | Plain, finely haired abdomen; legs one color with no spines; body no more than 3/8 inch 1 |
| Desert recluse (L. deserta) | 6, in three pairs | Native to Sonoran and Mojave desert areas; violin mark faint or missing 1 |
| Mediterranean recluse (L. rufescens) | 6, in three pairs | Introduced from southern Europe; its bites do not cause the severe reactions linked to the brown recluse 3 |
| Southern house spider | 8 | The spider most often mistaken for a recluse in Louisiana 4 |
| Cellar, wolf, sac and grass spiders | 8 | Often have dark marks, striped legs or leg spines; eight eyes rule them out 1 |
UC IPM lists five features a recluse must have all at once: six eyes in pairs, a plain hairy abdomen, no leg spines, one-color legs and a body of 3/8 inch or less 1. If you are unsure, our pest identifier tool walks through visible clues before anyone treats.
Example: what a heavy infestation looked like
This is a real, published case, not a forecast. It shows why finding recluses indoors is not the same as being bitten.
| Fact from the study | Published figure | What it tells you |
|---|---|---|
| Spiders collected | 2,055 brown recluses in 6 months, in a 19th-century Kansas home 1 | Large indoor numbers are possible inside the native range |
| Years lived there | Nearly a decade, still finding spiders regularly 1 | The family lived with the spiders long term |
| Bites in that time | One, on a finger, which turned red for a few days and healed 1 | Contact is rare because recluses avoid people |
| Sticky trap catch elsewhere | 44 caught in one day in a Tennessee home 1 | Traps show how dense a population is |
The point is not that recluses are harmless. About 10% of bites still damage skin 3. The point is that a sighting calls for calm identification and steady control, not panic or a whole-house spray.
Where the term shows up on paper
On an inspection report, a technician may list “recluse activity” with the spots found: garage shelving, attic, closets, boxes or wall voids. A good report says whether the spider was confirmed by its eyes or only suspected, and whether shed skins or egg sacs were seen.
On a service agreement, recluses are often listed separately from “general spiders.” Some plans cover them only as an add-on, because they take more visits. Our guide to reading pest control contracts explains how to check which pests a plan really covers.
On a product label, “brown recluse” or “spiders” must be named as a target pest for the product to be used on them. The label is a legal document, as the regulations section below explains.
On a medical chart, “suspected brown recluse bite” is common, but UC IPM warns that many such diagnoses are wrong, especially outside the spider’s range 1.
What works well against recluses
Extension guidance favors steady habits over sprays. These steps do the most good:
- Clearing woodpiles, boxes, tires and trash cans stored right next to the house removes outdoor hiding spots 1.
- Sealing cracks around doors and holes for pipes and wires blocks spiders and the insects they eat 2. See caulking for pest prevention and fitting a door sweep for the details.
- Storing seldom-used clothes, gloves and boots in tightly closed plastic bags or bins keeps spiders out of them 1.
- Sticky traps along baseboards catch spiders and show how many there are, without any insecticide 1.
- Pulling the bed away from the wall and removing bed skirts and under-bed storage cuts the chance of a spider climbing in 1.
Why recluses are hard to clear
Sprays reach only what they touch. UC IPM says chemical control is hard unless you can see the spider and treat it directly 1. Recluses hide deep in boxes, walls and clutter, where a quick spray never lands.
They are long-lived and patient. With a 2- to 4-year life span and months of survival without food, a population can outlast a single treatment 1.
Where conditions suit them, they are dense. UC IPM notes that “if you find recluses, you do not find one, you find many” 1. That is why one-visit plans rarely solve an established problem.
Insecticides are also not a long-term fix for spiders on their own. UC IPM advises pairing any treatment with housekeeping and sealing 2.
What drives the cost of recluse control
We do not publish prices here, because a fair figure needs many dated local quotes. What we can do is name what moves a quote.
The biggest factor is how widespread the spiders are. One garage costs less to treat than a home with spiders in the attic, closets and wall voids. Clutter adds labor, since each box and shelf is a hiding spot.
The number of follow-up visits matters, because a long-lived spider needs a plan that runs for months. Sealing and exclusion work, if the company offers it, adds materials and time.
Many companies cover recluses under a recurring pest control plan instead of a one-time visit. Our pest control cost guide explains how quotes are built and what to compare.
There is no warranty on a spider, but there is on the work. Ask how long a service guarantee lasts, what voids it, and whether call-backs between visits are free.
How a professional recluse job usually runs
Extension advice puts identification first, then a mix of habitat changes and targeted treatment 4.
- Confirm the spider. LSU calls identification by a qualified diagnostician the essential first step 4. Keep a caught spider whole so its eyes can be checked.
- Inspect and map. The technician checks garages, attics, basements, closets and storage, and places sticky traps to see where spiders are active.
- Cut hiding spots. You or the crew move boxes into sealed bins, clear piles near the house and reduce clutter.
- Seal entry points. Gaps at doors, foundations and utility holes are closed so spiders and their prey stay out 2.
- Treat where needed. A licensed applicator may treat cracks, voids and harborage areas with labeled products. Some dusts used for spiders are restricted to professionals 2.
- Monitor and repeat. Traps are checked on each visit. Falling catches show the plan is working.
Do not handle recluses with bare hands
Never pick up a suspected recluse. Trap it under a jar and slide paper underneath, or let a professional deal with it 1.
If you are bitten and the area spreads, darkens or you feel ill, see a doctor at once. For trouble breathing or a child who seems very sick, call 911. Poison Help, 1-800-222-1222, is free and confidential 7.
No permit is needed for a home spider treatment. The company and its applicators must be licensed by your state. Our page on how pest control licensing works explains what to check.
Everyday habits that keep encounters down
- Shake out shoes, clothing, towels and work gloves before use, especially if they sat on the floor or in a garage 51.
- Wear gloves and long sleeves when moving stored boxes, firewood or debris 5.
- Vacuum or sweep seldom-used corners, closets and storage areas often to remove spiders and webs 2.
- Keep window and door screens in good repair 2.
- Check sticky traps each month in spots where spiders were found, and replace them when full.
Saving a spider for ID
UC IPM suggests freezing the spider, then soaking it in rubbing alcohol for a few days. Pour off the alcohol and rinse it before mailing. Never mail a specimen in alcohol 1.
A wider pest monitoring routine catches the insects recluses feed on, which helps too. The seasonal pest calendar shows when spider activity tends to rise.
Bite warning signs and when to get help
Most bites are minor. These are the published patterns to watch for:
- A sting and local pain, often with a small white blister forming at the bite 5.
- About 90% of bites cause no reaction or a small red bump, about 5 mm across, that heals on its own 3.
- About 10% cause a dying-skin wound, where over about two weeks the skin turns dark, dries and peels away. These take two to four months to heal 3.
- Fewer than 1% cause whole-body illness, such as anemia or kidney injury. These are most common in children and are a true emergency 3.
- Several sores at once, sores that keep coming back, or several people with sores point to something else, such as a skin infection. UC IPM notes MRSA was the cause for 29% of “spider bite” patients in one national study 1.
Rules that apply to recluse control
Federal pesticide law. Under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), the U.S. EPA registers every pesticide sold in the country. Label rules are set in 40 CFR Part 156.
Every label carries the line “It is a violation of Federal law to use this product in a manner inconsistent with its labeling” 6.
A product may be used on recluses only if its label allows that pest and that site.
Professional-only products. UC IPM notes that some silica-based dusts used against spiders are restricted to licensed applicators 2. Our pesticide safety guide explains labels, signal words and storage.
State licensing. States license pest control companies and the people who apply pesticides for hire. Rules and license categories differ by state, so check yours with the license lookup tool.
No protected status. We found no federal or state rule that protects brown recluses. The rules here govern the products and the people, not the spider.
Brown recluse vs other spiders people worry about
| Feature | Brown recluse | Black widow | Common house spiders |
|---|---|---|---|
| Look | Plain tan to brown, six eyes 1 | Shiny black female with a red hourglass underneath 2 | Varied; eight eyes 1 |
| Web | Thin, messy sheet in its hiding spot 4 | Irregular web strung between objects 5 | Varied |
| Where in the U.S. | Central and southern states 3 | Throughout North America, most common in the South and West 5 | Everywhere |
| Bite effect | Mostly local; about 10% damage skin 3 | Venom acts on nerves; pain can spread through the body 5 | Usually minor or none |
The widow side of this table is covered in depth on our black widow page, linked under related terms.
Recluse web vs recluse egg sac
| Feature | Web or retreat | Egg sac |
|---|---|---|
| What it is | Thin, loose sheets and strands of silk in a hiding spot 4 | A compact, round silk case holding eggs 3 |
| Contents | Often the spider itself, or shed skins | 20–50 eggs 3 |
| When you see it | Any time of year | After summer mating; eggs hatch in a few weeks 34 |
| What it means | Spiders are using the spot | The spiders are breeding there |
Vacuuming webs and sacs in storage areas removes spiders and the next generation at once 2. Seal the vacuum bag and put it in an outdoor trash can.
Brown recluse myths, checked
- Myth A violin mark means it is a brown recluse.
- Reality The mark varies and is missing on some recluses, and many harmless spiders have similar marks. Six eyes in pairs is the reliable sign 1.
- Myth Brown recluses live in every state.
- Reality They are established in 16 central and southern states. Finds elsewhere are rare stowaways in moved goods 3.
- Myth Any dark, rotting sore is a recluse bite.
- Reality Infections such as MRSA, other bug bites, burns, shingles and diabetic ulcers are often mistaken for recluse bites 13.
- Myth If recluses are in the house, someone will be bitten.
- Reality A Kansas family collected 2,055 recluses in 6 months and had one minor bite in about 10 years 1.
- Myth Antibiotics treat the venom.
- Reality UC IPM notes antibiotics work on bacteria and have no effect on spider venom 1. Follow a doctor’s advice.
Whether brown recluses live in your state
Range is the one local fact that changes everything. Penn State lists the brown recluse as established in 16 states: Alabama, Arkansas, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Mississippi, Missouri, Nebraska, Ohio, Oklahoma, Tennessee and Texas.
Isolated finds have been reported in Arizona, California, the District of Columbia, Florida, North Carolina, New Jersey, Pennsylvania, Washington and Wyoming 3. Even within a state the picture varies.
LSU says the spider is common in northern Louisiana, north of a line through Alexandria, and very uncommon in the south of the state 4.
UC IPM reports fewer than 20 verified brown recluse specimens in California over several decades, though native desert recluses live in its southeastern deserts 1.
When it matters to you, and what to do next
Start with where you live. Outside the 16-state range, a brown spider is almost certainly something else, so get it identified before spending money 3. Inside the range, finding one recluse indoors usually means there are more 1.
If you see one or two in a garage or shed, clear clutter, seal gaps and set sticky traps for a month.
If traps keep filling, or you find spiders in bedrooms, closets or kids’ rooms, call a licensed company.
Ask how they confirm the species, how many visits are included and whether sealing is part of the plan.
Our guide to choosing a pest control company lists the questions to ask, and the site’s integrated pest management page explains the step-by-step approach good companies use.
Quick decision guide
Outside the native range, get the spider identified first. With one or two in storage, clean up, seal and trap. With steady catches or spiders in living areas, call a licensed pro. If a bite spreads or you feel ill, see a doctor now.
Questions about Brown Recluse Spider
How can I tell if a spider is a brown recluse?
Look at the eyes first: a brown recluse has six equal-sized eyes in three pairs, while most spiders have eight.
It also has a plain, finely haired abdomen, one-color legs with no spines, and a body no longer than 3/8 inch. UC IPM says a spider must have all of these to be a recluse. The violin mark alone is not reliable.
What states have brown recluse spiders?
Penn State lists 16 states where brown recluses are established: Alabama, Arkansas, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Mississippi, Missouri, Nebraska, Ohio, Oklahoma, Tennessee and Texas. Isolated finds have been reported in a handful of other states, usually carried in with moved boxes or goods. Outside that range, a breeding population is very unlikely.
What does a brown recluse bite look like?
Most brown recluse bites cause no reaction or a small red bump about 5 mm across that heals on its own, according to Penn State.
The CDC notes a sting, local pain and often a small white blister.
About 10% of bites form a wound where the skin darkens, dries and peels over about two weeks, and those can take months to heal.
Is a brown recluse bite an emergency?
Most are not, but some are. Fewer than 1% of bites cause whole-body illness, such as anemia or kidney injury, and these are most common in children, Penn State says.
Get medical care at once for a wound that spreads or darkens, fever, or feeling unwell. Call 911 for trouble breathing. Poison Help at 1-800-222-1222 is free and confidential.
Where do brown recluses hide in a house?
Brown recluses hide in dark, dry, undisturbed places. Indoors that means boxes, closets, attics, garages, behind stored items and inside wall cracks. They also crawl into shoes and clothes left on the floor. Outdoors they use woodpiles, tires, plywood and trash cans. Warm, dry spots suit them best, per Penn State Extension.
Do sticky traps work for brown recluse spiders?
Yes, sticky traps are one of the main tools for recluses. UC IPM recommends placing them along baseboards, out of reach of pets and young children.
They catch spiders without insecticide and show how many are present. In one Tennessee home, 44 recluses were caught in sticky traps in a single day. Check and replace traps regularly.
Will spraying get rid of brown recluses?
Spraying alone rarely solves a recluse problem. UC IPM says chemical control is hard unless the spider is seen and treated directly, because recluses hide deep in clutter and walls. Lasting control pairs reduced clutter, sealed gaps and trapping with targeted treatment by a licensed applicator where needed. Always follow the product label.
How long do brown recluse spiders live?
Brown recluses take about a year to mature and live 2 to 4 years on average, according to UC IPM. Some have lived more than 7 years in the lab. They can also survive 6 to 12 months without food. That long life is one reason control plans run over several months.
What does a brown recluse egg sac look like?
A brown recluse egg sac is a small, round case of off-white silk tucked into the spider’s hiding spot.
Penn State says each holds 20 to 50 eggs, and a female can make two to five sacs in her life. Finding sacs means spiders are breeding there. Vacuum them up and throw the sealed bag away outdoors.
Should I worry if I found one brown recluse?
Inside the native range, one recluse indoors usually means more are nearby, but it is not cause for alarm, LSU AgCenter says. Clean up storage areas, seal gaps and set sticky traps for a few weeks. If traps keep catching spiders, or they show up in bedrooms, call a licensed pest control company to inspect.
Sources
- UC Statewide IPM Program, Pest Notes: Brown Recluse and Other Recluse Spiders (Publication 7468), retrieved .
- UC Statewide IPM Program, Pest Notes: Spiders (Publication 7442), retrieved .
- Penn State Extension, Brown Recluse Spiders (updated September 8, 2025), retrieved .
- LSU AgCenter, Loxosceles spp., Brown Recluse and Mediterranean Recluse Spiders, retrieved .
- CDC NIOSH, Venomous Spiders, retrieved .
- U.S. EPA, Introduction to Pesticide Labels, retrieved .
- National Capital Poison Center, About Poison Control (1-800-222-1222), retrieved .
Expert review
Written by the HyrePest Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Identification, range, life history, densities and misdiagnosis facts follow UC IPM Pest Notes 7468 and Penn State Extension. Size, egg-sac and Louisiana range facts are from LSU AgCenter.
Bite symptoms and first-aid framing are from CDC NIOSH and Penn State. Label law is from the EPA. Held (G-REV) until an extension entomologist confirms the range facts and a physician reviews the bite guidance.
Suggest a correction. We fix errors and say what changed.