What do bed bugs look like?

Adults are oval, flattened, wingless, rusty to mahogany brown, about 4–7 mm. After feeding they look darker and more elongated. Nymphs are smaller and paler. Eggs are tiny, white, in crevices. Look for dark faecal spots and shed skins in mattress seams and bed frames.

How do I know if I have bed bugs?

Confirm by finding live bugs, faecal spots (dark smears that smear reddish when wiped), shed skins, or eggs in mattress seams, headboards, or cracks. Bites in rows or clusters can suggest bed bugs but are not enough on their own — other causes exist.

Bat bugs look like bed bugs but have longer hairs on the thorax (visible under magnification) and are associated with bat roosts. If you have bats in the roof or attic and find bed-bug-like insects, get a professional to confirm. Bat exclusion must be done by a specialist.

Common vs tropical bed bug?

Both occur in South Africa; tropical bed bug is more common in northern/warmer regions. They look very similar; treatment is the same. Professional inspection can identify species if needed.

When should I get professional help?

As soon as you confirm or strongly suspect bed bugs. DIY sprays rarely reach all harbourages; infestations grow quickly. Professional heat treatment or thorough insecticide treatment targets all life stages and hiding places.

How do I use the quick comparison table?

Match what you see (size, colour, where found, behaviour) to the table to tell bed bugs from tropical bed bugs and from lookalikes like bat bugs or carpet beetles. Then read the matching species card for full details and when to get help.

Bed Bug Identification Guide

Bed bugs are small, blood-feeding insects that hide in seams, cracks, and furniture and feed at night. Correct identification — and distinguishing them from bat bugs, carpet beetles, or other lookalikes — helps you act quickly and choose the right treatment. South Africa has both the common bed bug (Cimex lectularius) and the tropical bed bug (Cimex hemipterus). This guide covers what they look like, where you find them, key signs, and when to get professional help.

Identify bed bugs, tropical bed bugs, and lookalikes. Know the signs: stains, shed skins, eggs, bites, and harbourages.

Need help with bed bugs?

Call Get a quote See Bed Bug Treatment

Adult pointing out a bed bug on the bed — identification guide context; species cards below show close-up ID photos

How to use this guide

Look at size and shape — adult bed bugs are oval, flattened, about 4–7 mm; nymphs are smaller and paler.
Check colour — unfed they are rusty or mahogany brown; after feeding they are darker and more elongated.
Note where you found them — mattress seams, headboards, bed frames, cracks, behind pictures, or in luggage.
Look for signs — dark faecal spots, shed skins, tiny eggs, or blood spots on bedding.
Consider bites — often in rows or clusters on exposed skin; bites alone are not enough to confirm bed bugs.
Then match to the species card and rule out lookalikes (e.g. bat bug, carpet beetle) using the quick comparison table.

Quick comparison

Bug / Lookalike	Colour	Size	Commonly found	Key clue
Common bed bug	Rusty to mahogany brown; darker after feeding	4–7 mm adult; nymphs 1–4 mm	Mattress seams, headboards, bed frames, cracks, furniture	Wingless; flat; hides by day; feeds at night on humans
Tropical bed bug	Reddish-brown; similar to common bed bug	Up to ~8 mm; slightly longer	Same harbourages as common bed bug; warmer regions	Same habits; more common in northern/tropical parts of SA
Bat bug (lookalike)	Brown; very similar to bed bug	Similar to bed bug	Near bat roosts; attics; sometimes beds if bats present	Prefers bats; long hairs on thorax; same family, different host
Carpet beetle / other	Varied; often mottled or patterned	Variable	Carpets, fabrics, stored products	Not blood-feeders; different shape; no bite pattern like bed bugs

Species at a glance

Use the cards below to match what you see — appearance, where they are found, and behaviour.

Common Bed Bug

Cimex lectularius

Appearance

Oval, flattened, wingless; rusty to mahogany brown; darker and more elongated after feeding
Adult about 4–7 mm long; nymphs 1–4 mm, paler (cream to light brown)
Short antennae; broad head; no wings; visible eyes
Eggs: tiny (~1 mm), pearly white, in crevices and seams
Shed skins (exuviae) pale and translucent where nymphs moulted

Commonly found

Mattress seams and tagsHeadboards and bed framesBox springsCracks in walls or skirtingBehind pictures and electrical platesFurniture near the bedLuggage and bagsUpholstered chairs and sofas

Behaviour

Nocturnal blood-feeders; hide in cracks and seams by day and come out to feed on sleeping humans. Can survive months without a meal. Spread by hitchhiking on luggage, clothing, and second-hand furniture. Eggs hatch in about 1–2 weeks; several nymphal stages. Bites often in rows or clusters; not always felt at the time. The main bed bug pest in South Africa and worldwide.

Why you may be seeing them

Introduced via travel, second-hand furniture, or from adjacent rooms. Once present, they establish in mattress seams, frames, and nearby harbourages. Faecal spots (dark, smears or dots), shed skins, and eggs are typical signs. Bites on arms, legs, or torso may prompt a search.

Often confused with

Tropical bed bug (very similar; slightly larger; more common in warmer regions) · Bat bug (similar appearance; longer hairs on thorax; associated with bats) · Carpet beetle (different shape; not a blood-feeder)

When to get help

Any confirmed or suspected bed bugs — get a professional inspection. DIY sprays rarely reach all harbourages; heat treatment or thorough insecticide treatment is usually needed. Do not delay; infestations grow quickly.

Common across South Africa. Correct ID avoids confusion with bat bugs or other insects; treatment is the same for common and tropical bed bugs.

Common bed bug pest guide Need help with bed bugs? See Bed Bug Treatment Cape Town

Tropical Bed Bug

Cimex hemipterus

Appearance

Reddish-brown; oval, flattened, wingless; very similar to common bed bug
Slightly longer — up to about 8 mm
Same general shape; pronotum and other details differ under magnification
Eggs and nymphs similar to common bed bug

Commonly found

Same harbourages as common bed bugMattress seams, bed frames, furnitureMore abundant in northern KwaZulu-Natal and warmer regionsCan occur alongside common bed bug (sympatric)

Behaviour

Same feeding and hiding behaviour as common bed bug. Occurs in tropical and subtropical areas; in South Africa both species are found, with tropical bed bug more common in the north. Control approach is the same as for common bed bug.

Why you may be seeing them

Same introduction routes: travel, second-hand items, or from neighbouring premises. Signs (faecal spots, shed skins, bites) are the same. Identification to species level is mainly for records; treatment does not differ.

Often confused with

Common bed bug (nearly identical without magnification) · Bat bug (check for bats and thorax hairs)

When to get help

Same as common bed bug — professional inspection and treatment. Heat treatment or thorough insecticide application reaches all harbourages.

In northern Natal and KwaZulu both C. lectularius and C. hemipterus have been recorded. Treatment is identical.

Tropical bed bug pest guide Need help with bed bugs? See Bed Bug Treatment Cape Town

Bat Bug (lookalike)

Cimex adjunctus / Cimex pilosellus (and related)

Appearance

Very similar to bed bug; brown, oval, flattened
Longer hairs (setae) on the thorax than bed bugs — visible under magnification
Same size range as bed bugs

Commonly found

Attics and roof spaces where bats roostSometimes in living areas if bats are in the structureNear bat entry points

Behaviour

Bat bugs prefer bats as hosts but can bite humans if bats leave or in mixed settings. Same family as bed bugs (Cimicidae). If you have bats and find “bed bug”-like insects, they may be bat bugs. Managing the bat colony and sealing entry points (after bats have left) is part of the solution; treatment of living areas may still be needed.

Why you may be seeing them

Bats in the roof or walls; insects that look like bed bugs in the bedroom. Distinguishing bat bug from bed bug avoids misdirected treatment — bat bugs often decrease once bats are excluded (by a licensed professional).

Often confused with

Common bed bug (shorter thorax hairs) · Tropical bed bug

When to get help

If you have bats and suspect bat bugs, get a professional to confirm ID and advise on bat exclusion (must be done legally and humanely) plus any treatment of living space. Do not treat bats yourself.

Identification matters: bat bugs are often linked to bat roosts. Solving the bat issue (with expert help) can reduce bat bug problems.

Bat bug lookalike pest guide Need help with bed bugs? See Bed Bug Treatment Cape Town

Common signs by location

Where you find stains, shed skins, or live bugs — mattress, headboard, luggage, or furniture — points to bed bugs or bat bugs. Use this to narrow down identification.

Mattress seams and tags
Classic harbourage. Look for live bugs, dark faecal spots, shed skins, and tiny white eggs.
Common bed bugTropical bed bug
Headboard and bed frame
Cracks, joints, and screw holes. Faecal spots and shed skins often visible.
Common bed bugTropical bed bug
Box spring
Inside folds and along edges. Lift and inspect; use a torch.
Common bed bugTropical bed bug
Skirting and wall cracks
Bugs can travel from beds to nearby cracks. Check behind furniture.
Common bed bugTropical bed bug
Luggage and bags
Hitchhikers from travel. Inspect after trips; wash and heat-treat if concerned.
Common bed bugTropical bed bug
Second-hand furniture
Inspect before bringing indoors. Seams and crevices can harbour bugs and eggs.
Common bed bugTropical bed bug
Attic or roof with bats
Bat bugs may be present. Do not confuse with bed bugs; bat exclusion needs a specialist.
Bat bug

Why bed bugs keep coming back

Missed harbourages — bugs hide in cracks, behind fittings, and in furniture; incomplete treatment leaves refuges.
Eggs — eggs can hatch after treatment; heat treatment kills eggs; some chemical treatments need follow-up.
Reintroduction — travel, second-hand furniture, or shared laundry can bring bed bugs back.
Resistant populations — some populations resist certain insecticides; heat treatment avoids resistance.
Neighbouring units — in flats or semis, bugs can move between units; coordination and proofing help.
Treatment did not reach all life stages — nymphs and eggs in deep crevices may survive if treatment is not thorough.

Common bed bug signs and behaviour

These patterns help you confirm bed bugs and tell them apart from other causes of bites or stains.

Dark spots on mattress or bedding
Faecal spots (digested blood) are a key sign. Often along seams or near where people sleep. Wipe with a damp cloth — if it smears reddish-brown, it may be bed bug faeces.
Shed skins in crevices
Nymphs moult five times. Pale, translucent skins left in seams, behind headboards, or in cracks. Indicates active infestation.
Bites in rows or clusters
Bed bug bites are often in lines or groups on exposed skin (arms, legs, neck). Bites alone do not confirm bed bugs — other insects and skin conditions can look similar. Need to find bugs or signs.
Sweet or musty odour
Heavy infestations can produce a noticeable smell. Not always present; use other signs to confirm.
Live bugs when you lift mattress or search at night
Use a torch; check seams and folds. Adults are rusty brown, oval, flat. Nymphs are smaller and paler. If you see them, get professional treatment.
No signs in bed but bites continue
Check furniture, luggage, and other rooms. Bugs can hide in chairs, behind pictures, or in cracks. Professional inspection can locate harbourages.

When to get professional help

You see live bed bugs or find shed skins, eggs, or faecal spots
Bites in rows or clusters and you suspect bed bugs
Returning from travel or brought in second-hand furniture and want an inspection
Previous DIY treatment did not stop the problem
You live in a flat or semi and want to avoid spread to or from neighbours
You need heat treatment (chemical-free) or thorough insecticide treatment

Call Get bed bug treatment

Ready to get rid of bed bugs?

Professional inspection and treatment — heat treatment or thorough insecticide — so every harbourage is covered.

Get a quote Bed Bug Treatment Cape Town

Bed Bug Identification Guide

Identify bed bugs, tropical bed bugs, and lookalikes. Know the signs: stains, shed skins, eggs, bites, and harbourages.

How to use this guide

Look at size and shape — adult bed bugs are oval, flattened, about 4–7 mm; nymphs are smaller and paler.

Check colour — unfed they are rusty or mahogany brown; after feeding they are darker and more elongated.

Note where you found them — mattress seams, headboards, bed frames, cracks, behind pictures, or in luggage.

Look for signs — dark faecal spots, shed skins, tiny eggs, or blood spots on bedding.

Consider bites — often in rows or clusters on exposed skin; bites alone are not enough to confirm bed bugs.

Then match to the species card and rule out lookalikes (e.g. bat bug, carpet beetle) using the quick comparison table.

Quick comparison

Bug / Lookalike	Colour	Size	Commonly found	Key clue
Common bed bug	Rusty to mahogany brown; darker after feeding	4–7 mm adult; nymphs 1–4 mm	Mattress seams, headboards, bed frames, cracks, furniture	Wingless; flat; hides by day; feeds at night on humans
Tropical bed bug	Reddish-brown; similar to common bed bug	Up to ~8 mm; slightly longer	Same harbourages as common bed bug; warmer regions	Same habits; more common in northern/tropical parts of SA
Bat bug (lookalike)	Brown; very similar to bed bug	Similar to bed bug	Near bat roosts; attics; sometimes beds if bats present	Prefers bats; long hairs on thorax; same family, different host
Carpet beetle / other	Varied; often mottled or patterned	Variable	Carpets, fabrics, stored products	Not blood-feeders; different shape; no bite pattern like bed bugs

Common Bed Bug

Cimex lectularius

Appearance

Oval, flattened, wingless; rusty to mahogany brown; darker and more elongated after feeding
Adult about 4–7 mm long; nymphs 1–4 mm, paler (cream to light brown)
Short antennae; broad head; no wings; visible eyes
Eggs: tiny (~1 mm), pearly white, in crevices and seams
Shed skins (exuviae) pale and translucent where nymphs moulted

Commonly found

Mattress seams and tagsHeadboards and bed framesBox springsCracks in walls or skirtingBehind pictures and electrical platesFurniture near the bedLuggage and bagsUpholstered chairs and sofas

Behaviour

Why you may be seeing them

Often confused with

When to get help

Common across South Africa. Correct ID avoids confusion with bat bugs or other insects; treatment is the same for common and tropical bed bugs.

Common bed bug pest guide Need help with bed bugs? See Bed Bug Treatment Cape Town

Common signs by location

Where you find stains, shed skins, or live bugs — mattress, headboard, luggage, or furniture — points to bed bugs or bat bugs. Use this to narrow down identification.