11 Tiny Brown Bugs In Bathroom – An Easy ID Guide

Bathrooms are damp and attract bugs. I previously listed tiny black bugs that infest bathrooms, but brown bugs can also be problematic. 

This guide will help you identify the types of tiny brown bugs in bathroom and how they invade your bathroom.

Key Takeaways:

1 – Springtails, stink bugs, bed bugs, psocids, cockroaches, brown ants, carpet beetles, house centipedes, brown beetles, fruit flies, and spiders are 11 little brown bathroom bugs.

2 – Moisture and food sources such as molds in the bathroom attract these tiny insects. These insects attract their predators like spiders and house centipedes.

3 – Eliminating damp areas in the bathroom, extensive cleaning, sealing their entry points, and, in case of severe infestation, hiring a pest controller eliminate these bugs.


Springtails - Tiny brown bugs in bathroom

Springtails are tiny jumping insects that sneak inside bathrooms from the outdoors.

They jump through the open bathroom windows or vents. 

As springtails are moisture bugs, they’ll end up in your bathroom from other areas of your home.

Springtails live in moist soil and decaying organic matter outdoors.

They sneak inside homes during the dry season, looking for moisture and food sources.

Springtails are 2 mm in size, cylindrical, slender-bodied, and have a pair of antennae. 

These bugs have a secret coil-like organ, furcula, tucked inside their abdomen.

Springtails unroll the furcula by pushing them against the surface, enabling them to jump. 

They’ll hide in the cracks and crevices in the bathroom floor and walls.

The tight gaps underneath fixtures, such as the bathtub and the damp areas under the sink, are also their hideouts.

Springtails are harmless insects that don’t bite. They don’t cause any damage to the home either.

Springtails feed on the molds and fungi that form in the bathroom. 

Stink Bugs

Stink Bugs In Bathroom

Stink bugs enter homes and bathrooms in the late fall and winter for warmth.

According to Professor of Entomology Michael Joseph Raupp at the University of Maryland, these bugs look for warm places to overwinter. That’s why they enter homes.

However, stink bugs are also attracted to light. So, I’ve also seen them invading my home and bathroom at night during the summer months.

Stink bugs can fly. So, they fly inside the bathroom through the windows or vents.

They can also crawl through the gaps on the windowsills and wall cracks.

Stink bugs are shield-shaped insects with an uneven texture on their back. They’re brown, but they can also be green or gray.

An adult stink bug grows up to 5/8 inch or 15.8 mm in size.

They hide in the wall voids and the cracks in the bathroom walls.

But they can also hide in places like the basement and attic where there’s less human footfall.

Stink bugs don’t bite or sting. But some stink bug species can bite if you try to handle them.

Stink bugs emit a nasty odor if you try to crush them or if they feel threatened. That’s their way of self-defense.

Bed Bugs

Bed Bugs In Bathroom

Bed bugs don’t limit themselves to your bed or bedroom. 

When the infestation worsens, these parasitic insects can move to other areas of your home, including bathrooms.

Bed bugs move from one home to another by hitchhiking. And they spread from one room to another in the same house in the same way.

Transferring fabric, such as towels or sheets, or moving furniture from an infested room to your bathroom can cause bed bugs.

These pests can also crawl to your bathroom from the infested room.

It typically happens when there are too many bed bugs in one room, and they look for other places to hide.

Bed bugs in the bathroom will hide in wall voids, crevices on the furniture, and fabric piles. 

Bed bugs are dark brown, oval, and flat, like apple seeds. Their size ranges from 5-7 mm or 3/16 – 1/4 inch. 

Bed bugs turn reddish brown after feeding on human blood.


Psocids in bathroom

Psocids are tiny tan bugs that feed on the molds and fungi that form on bathroom fixtures, shower grout, walls, and floors. 

Psocids, or booklice, are moisture bugs that sneak inside the house looking for damp areas to hide.

These little bugs are soft-bodied, translucent, oval, growing 1-2 mm in size. 

They can resemble baby roaches in the bathroom. But psocids are harmless to humans and pets.

They don’t cause any severe damage to your home. 

But psocids can damage old books with molds on the book bindings. They can also get inside stored grains, such as rice with molds. 


Cockroach in bathroom

Cockroaches are common bathroom pests that hide in the bathroom drains and inside tight gaps, such as underneath fixtures like sinks and bathtubs.

Many species of cockroaches can hide in bathrooms. But the most widespread ones are the American cockroaches.

American cockroaches are giant reddish-brown roaches known in Florida as water bugs or palmetto bugs.

These roaches will lay eggs in the sludge, blocking the drains. 

The eggs hatch and produce small baby roaches. American cockroach babies are dark brown with a pair of large antennae. 

You notice them crawling on the bathroom floor and sinks, searching for food.

Tiny Brown Ants – Pharaoh Ants And Pavement Ants

Ants invade homes looking for moisture and food sources. 

If you see brown ants in your bathroom, they can be pharaoh ants or pavement ants.

Pharaoh ants are light yellow or reddish brown with a dark abdomen.

Pharaoh Ants In Bathroom

These ants grow 1.5 – 2.5 mm in size and primarily target your kitchen because of greasy and sweet foods.

However, when the infestation in the house becomes severe, they can search for new damp areas of your home to expand their colony. 

So, their options are bathrooms and basements with high moisture content.

Pavement ants make their nests in the cracks on the walls and floor. 

Pavement ants in bathroom

These ants also enter homes looking for dampness and food sources. 

So, the wall voids and cracks on furniture in bathrooms and kitchens are their go-to areas to hide.

Pavement ants are dark brown or black. And they’re tiny, growing up to 3 mm in size.

Ants in a bathroom are noticeable when you see a random ant crawling on the bathroom floor or walls.

You can also see an ant trail that leads to their nesting site or food source.

But there can be many ant-like bugs in the bathroom that can trick you into thinking that they’re ants.

Carpet Beetles

Adult Carpet beetles in bathroom

Carpet beetles can be present in the bathroom, both in adults and in the larval form.

Adult carpet beetles come in three colors – brown, black, or spotted. They grow up to 1/16 – 1/4 inch or 1.5 – 3mm in size.

The adults enter homes by flying on or crawling through open windows and the cracks on the windowsills.

They lay their eggs in the carcasses of dead insects stuck in the wall voids, on natural fibers such as wool, and in stored foods.

They do so because all these egg-laying grounds are food sources for the carpet beetle larvae.

Adult carpet beetles are harmless. They don’t cause any damage inside the house.

However, the carpet beetle larvae, which are dark brown with tan or yellow stripes, hairy bristles, and 5/16 inch in size, are damaging fabric and food pests.

They also feed on broken human hair and pet fur.

And they scavenge the entire home looking for these and dead insects.

While doing so, the larvae end up in your bathroom. 

Dirty clothes piles and waste in the garbage can inside the bathroom also attract the carpet beetle larvae. 

House Centipede

house centipede in bathroom

House centipedes are scary-looking bugs with 15 pairs of legs. They’re 1-2 inches in size, and they’re grayish-yellow, appearing as light brown. 

Centipedes enter homes from the outdoors when the weather becomes too dry and hot for them. 

They prefer damp areas of the house. So, their common hideouts are places like bathrooms, kitchens, and basements.

Centipedes will hide in the cracks and gaps in the bathroom floor and walls. 

The tight gaps and spaces underneath or behind bathroom fixtures such as sinks and bathtubs are also their hideouts.

House centipedes are nocturnal insects. In the bathroom, they remain hidden during the day and come out at night to hunt for other small insects, such as silverfish. 

House centipedes carry venom and can bite if you try to handle them. 

But their bites won’t kill you. You may face some discomfort, such as itching and a slight swelling on the skin after the bite.

The best part is that house centipedes are shy and avoid human contact. 

The first thing that house centipedes do when encountering a human is that they scurry across the floor and look for the tightest gap where they can slide in.

But they can breed inside the bathroom and produce baby centipedes. 

So, a few house centipedes in the bathroom can cause an infestation. 

Small Brown Beetles – Drugstore Beetles And Rice Weevils

Pantry beetles, such as drugstore beetles and rice weevils that infest stored food grains in your kitchen can spill over to your bathroom. 

It typically happens when their larvae mature into adults. And their search for moisture makes them spread into places like the bathroom. 

Pantry beetles and other food bugs make their way into your kitchen by being present in the egg and larval forms in the food packets and grain bags you buy.

If your house is near a grain warehouse or a big grocery store, many of these beetles can also fly inside your home. 

Drugstore beetles are 3.5 mm in size, oval, and brown. Their heads bend inwards, and they’ve longitudinal pits on their wing pads. 

Drugstore beetles in bathroom

They have a pair of three-segmented clubbed antennae, and these beetles are often confused with red flour beetles.

Rice weevils are reddish-brown or black with four yellowish spots on their wing pads or elytra.

Rice weevils

They have a snout on their mouth, which they use to poke grains to feed on them.

Rice weevils grow up to 3 mm long and have cylindrically oval bodies.

Fruit Flies

Sudden appearance of gnats in the house

Fruit flies enter bathrooms from the windows and vents to live in moist areas.

Your bathroom can become the epicenter of fruit fly infestation in the house because these flies lay eggs in the sludge choking the shower and sink drains.

Many believe fruit flies are commonly associated with overripe and rotting fruits and food waste. It’s true to an extent.

Fruit flies can infest homes despite no fruit and waste.

And when it happens, it means that fruit flies are breeding in the drains and even in appliances such as dishwashers.

Fruit flies are small flies. They grow up to 3 mm or 1/8 inches. These flies are tan or yellowish and have a pair of red eyes.

Fungus gnats, drain flies, and phorid flies share the same habitat as fruit flies.

Most of the time, these tiny flies are often confused with fruit flies because of their similar sizes.

Fruit flies don’t bite, and they don’t cause any diseases either.

But these flies are a big nuisance in the house and cause intense irritation because they swarm at humans.

Fruit flies are active during the summer. But they can remain active in the winter months in a heated home.


House spider in bathroom

Other insects in the bathroom can draw their most common predators, spiders.

Spiders enter homes for warmth, food sources such as other insects, and shelter.

Different species of spiders can hide in the bathroom, but the brown spiders are most often brown recluse and the American house spider.

These spiders will hide in the clutter and the gaps in your bathroom.

Spiders, especially the brown recluse, are venomous. And they can bite if you try to handle them or if they feel threatened.

Spiders will lay hundreds of eggs inside the bathroom and in other cluttered areas of your home. They bundle them in spherical egg sacs made from their silken webs.

These eggs, when hatch, worsen the spider infestation in the house.

Web-spinning spiders like daddy longlegs will create webbings on the bathroom walls and ceilings. 


Moisture and waste in the bathroom draw insects. These insects can attract their predators, such as centipedes and predators, to your bathroom.

Clean the bathroom, remove molds, fix moisture issues, seal entry points, and hire a pest controller to eliminate and prevent these brown bathroom bugs.

However, these brown insects in the bathroom also signify they’re in other areas of your home, such as the kitchen and basement.

Leave a Comment

Your email address will not be published. Required fields are marked *