Bed bugs or fleas?
Both cause itchy bites. Both can be present without being immediately visible. But bed bugs harbour in mattress seams and feed only at night while you sleep, while fleas live in carpet fibres and primarily target pets. The treatment for each has no meaningful overlap — committing to the wrong programme leaves the actual pest untouched.
Quick comparison
| Evidence | Bed bugs | Fleas |
|---|---|---|
| Bite location | Upper body — neck, arms, shoulders | Lower body — ankles, lower legs |
| Bite pattern | Linear or clustered (3+ per group) | Random individual bites |
| Physical evidence | Blood spots, smear marks in mattress seams | Flea dirt in pet fur, jumping insects |
| Pet involvement | None — pets not affected | Primary host — pets scratch intensely |
| Mobility | Walks only — no jumping or flying | Jumps — visible from carpet and bedding |
| Harbourage | Mattress seams, headboard, bed frame | Pet bedding, carpet fibres, soft furnishings |
| Treatment | Heat treatment or residual insecticide + follow-up | Simultaneous pet + home treatment same day |
Bed bugs
Cimex lectularius
Bite pattern
Linear or clustered — bites in rows of 3 or small groups (sometimes described as "breakfast, lunch, dinner"). Multiple bites per feeding event on the same skin area.
Bite location
Exposed skin during sleep: face, neck, shoulders, arms, upper chest. Not concentrated on ankles or lower legs.
Pets
Does not infest pets and does not feed on pets as a preference. Feeds on humans (and occasionally other warm-blooded hosts). Pet ownership is not a risk factor.
Mobility
Walks only. Cannot jump or fly. Moves along surfaces from harbourage to host.
Physical evidence to look for:
- Small blood spots (haemoglobin smears) on pillowcase or sheet — from engorged bugs crushed during sleep
- Dark brown or black smear marks in mattress seams, tufts, and along piping — digested blood excretion
- Translucent shed skins (exuviae) near harbourage points — tan-coloured, empty insect shells
- Sweet, musty odour in heavily infested rooms — secreted from glands in large populations
- Live bugs: flat, oval, 4–5mm, reddish-brown — found in mattress seams, headboard joints, bed frame crevices
Confirm this if you also notice:
- Bites appear on the upper body — neck, shoulders, arms, face
- Blood spots or dark smear marks in mattress seams
- Bites worsen in the bed and are not present when away from home overnight
- No pets in the property or no pet-scratching behaviour observed
- Bite marks appear in linear clusters, not random individual dots
Rule this out if:
- Bites are concentrated on ankles and lower legs only
- Visible jumping insects on carpet or pet bedding
- Pet scratching intensely — fleas on the animal
- Population reduces significantly when the pet is treated
Treatment approach
Heat treatment (whole-room 50°C for 90+ minutes) or targeted residual insecticide application with mandatory follow-up. All bedding, soft furnishings, and luggage must be treated simultaneously. Bed bugs cannot be resolved with a single spray treatment — follow-up inspection after 2–3 weeks is required.
Methodology: heat vs integrated chemical programme: how to choose and what preparation is requiredFleas
Siphonaptera; cat flea (Ctenocephalides felis) is the most common species in South Africa
Bite pattern
Random individual bites — not in linear rows. Intensely itchy small red dots with a reddened halo. Multiple bites may appear but without the clustering pattern of bed bugs.
Bite location
Concentrated below the knee — ankles, lower legs, feet. Fleas jump from carpet and floor level; they cannot reach the upper body in most cases without direct pet contact.
Pets
Primary host is pets (cats and dogs). Humans are incidental hosts. Flea populations are strongly correlated with pet presence. Fleas can persist without pets for months from pupae in carpet fibres.
Mobility
Jumps — can leap up to 33cm vertically and 50cm horizontally. Jumping is visible.
Physical evidence to look for:
- Flea dirt: black specks in pet fur or on pet bedding that turn red-brown when moistened on a white tissue (digested blood)
- Visible jumping insects from carpet, pet bedding, or soft furnishings — fleas jump and are visible if you observe carefully
- Pets scratching intensely, particularly at the base of the tail, belly, or neck
- Small fast-moving insects on the pet's coat — visible with part-of-fur inspection
- Flea larvae (white, thin, 1–2mm) in carpet fibres and pet bedding — difficult to see without magnification
Confirm this if you also notice:
- Bites concentrated on ankles and lower legs
- Pets scratching intensely
- Visible jumping from carpet or pet bedding when disturbed
- Flea dirt found in pet fur — turns red on wet tissue
- Property has had pets recently (fleas can persist in pupae for months)
Rule this out if:
- Bites appear on the upper body (neck, shoulders, arms)
- Blood spots or smear marks found in mattress seams
- No pets and no recent pet exposure in the property
- No jumping insects visible anywhere in the property
Treatment approach
Simultaneous treatment on the same day: pet treatment with a veterinary-approved product AND home treatment of all carpets, soft furnishings, and pet bedding with a residual insecticide. Treating only the pet or only the home will fail — the flea lifecycle continues in the other. Flea pupae in carpet fibres are insecticide-resistant for 2–4 weeks; a follow-up visit is required.
Methodology: simultaneous pet-and-premises protocol: why treating one without the other always failsWhy identification must come before treatment
Bed bug heat treatment will not address fleas in carpet fibres. Flea residual insecticide on carpets will not penetrate mattress seams where bed bugs harbour. A household that treats for bed bugs when fleas are present will continue to receive bites — the source is untouched. A professional inspection is the most efficient path to a correct diagnosis when physical evidence is ambiguous.
Common questions
Not sure which pest you are dealing with?
A professional inspection will confirm the pest, identify the harbourage, and determine the correct treatment programme. Getting the identification right before treatment is the most cost-effective approach.
Request an inspection