Early warning
Signs of Bed Bugs and What to Do Next
The six signs ranked by how much each one is actually worth, what to do in the first day, and the three moves that make everything harder.
One of these is proof. The other five are degrees of likely.
The signs of bed bugs are not all worth the same, and treating them as if they are is how households end up spending money on the wrong problem. One find settles the question outright. Another is strong evidence. Two more are suggestive. And the sign people act on fastest, marks on skin, is the weakest of the lot.
This page ranks them in order of how much each one is genuinely worth, then deals with the part most pages skip: what to do in the first day, and the three decisions that quietly make everything that follows harder and dearer. If you want the wider set of household pest writing, it is indexed in the pest control guides.
It is written as a decision page. Read the ranking, work out which column you are in, then act once rather than five times.
Ranked
What are the early signs of bed bugs?
Six things turn up, and they are not equal. A live insect proves it. Eggs and shed skins prove breeding on site. Dark spotting along a seam is the sign a torch finds most dependably. Blood smears on a sheet are suggestive. Marks on skin, which is what sends nearly everyone looking, prove nothing on their own at all.
| Sign | How much it is worth | What it tells you |
|---|---|---|
| A live insect | Conclusive | Settles it. Keep the specimen rather than squashing it. |
| Eggs | Conclusive, and hard to see | Pale grains glued in a crevice, meaning breeding here, not passing through. |
| Shed skins | Very strong | Hollow husks left as juveniles grow, so the population is established. |
| Dark spotting | Very strong | Digested blood dotted along piping and inside joints. Easiest real sign to go looking for. |
| Blood smears on sheets | Suggestive | Something fed and got crushed. Worth a proper search, not a treatment. |
| Marks on skin | Weak on its own | Shared with fleas, mosquitoes and skin reactions. A reason to look, never a diagnosis. |
A seventh sign turns up late rather than early. A heavily used hiding place can give off a sweetish, slightly sticky odour, noticeable in a small closed bedroom. Nobody finds a problem that way at the start, and if you can smell it the question has already moved on from whether you have them.
Timing throws people in Melbourne because this pest ignores the seasons the rest of them follow. Wasps and mosquitoes arrive on a calendar; this one lives inside and a warm Melbourne house keeps it breeding straight through winter. What does follow a pattern is travel, so the summer visitor peak and the school holiday weeks are when the calls cluster.
Make it certain
How do you confirm it before you act?
Strip the bed, take a bright torch to the head end of the mattress, and run a card through the piping, the tufting, under the care label and into the folded corners before you move down to the base and the frame. Anything you find goes in a jar or on a piece of tape and gets photographed next to a coin, which makes identification quick.
- Light it properlyKeep the torch almost flat against the fabric, because a low raking beam throws shadows off raised seams.
- Work head to footThe top third of the bed first, since early arrivals settle closest to where someone's head rests.
- Keep the evidenceTape or jar whatever turns up, note the exact spot, and photograph it with something for scale.
If that search comes up empty and marks keep appearing, do not treat the room anyway. Put smooth-sided interceptor cups under each bed leg. They collect whatever is travelling between the bed and the floor, which turns a vague worry into a number you can check, then look again after a week. A second search at around two in the morning with a torch also catches what a lunchtime look misses.
The full room by room routine, including the bed base, bolt holes, skirting joins and the hotel version for travelling, is in the guide on inspecting for bed bugs properly. If what is really bothering you is the skin rather than the room, the page on identifying and caring for bites covers that side honestly.
First 24 hours
What should you not do straight away?
Three things, and they are the three everybody reaches for. Do not move to another room, do not throw furniture out, and do not start spraying. Each one feels like taking control, and each one turns a contained problem in one bedroom into a larger, more expensive problem spread across the house.
Do not change rooms
Sleeping on the couch or in a spare room takes the food source with you, and the insects follow. Seven nights elsewhere usually buys you one more affected room and a far bigger job.
Do not throw things out
Carrying a mattress or a bed base through the house sheds insects along the hallway, and a new one delivered into a room that has not been treated is taken over almost immediately. Furniture decisions belong after the treatment, not before it.
Do not start spraying
Retail product scatters what you could otherwise point at, leaves eggs untouched, and makes the eventual inspection longer because the population no longer sits in one place.
There is a fourth, quieter mistake: deciding to wait and see. A female lays steadily day after day for months, so a fortnight of hoping is a fortnight of growth, and what separates a contained bedroom from an affected flat is usually nothing more than how long it was left.
Most of the big jobs Tim attends began as small ones that sat untouched for a month.
What you can usefully do in that first day is small and dull: strip the bed, put the bedding through the hottest wash it can take followed by a hot dryer run, seal anything unwashable into bags, clear storage out from under the bed, and leave every piece of furniture exactly where it is. That is it.
The decision
What should you do next?
Match the action to what you actually found. A single insect with nothing else around it is worth a careful search and a week of monitoring. Spotting or skins on the mattress means act now. Anything in the frame joints, the bedhead or the skirting means the room is involved and household measures will not reach it.
Possibly a hitchhiker from a trip or a bag. Search the whole bed, set interceptors, hot wash and dry everything, and check again in a week before spending anything.
Breeding on site. Prepare the room, stop experimenting with products, and get it treated before it spreads past the bed.
Frame joints, bedhead, skirting or a second bedroom. The structure is involved and the job now needs reaching into voids that nothing retail gets to.
Keep the interceptors running, check other beds and any lounge somebody naps on, and consider fleas or a skin reaction before treating a bedroom.
Two circumstances deserve a call straight away whatever you found. A unit in a block, because the units either side can keep pushing the problem back to you along shared walls and service penetrations, leaving a single treated flat under constant pressure. And a rental, where reporting it to the agent in writing on the day protects you later. Victoria handles these disputes through the usual repairs process, and the condition report plus the date you first put it in writing are what decide them, so there is nothing to gain from waiting. The Consumer Affairs Victoria guidance for renters explains the steps.
When it is time to hand it over, what the visit covers, how the bed is dealt with and why a return trip is booked in advance are described on the Melbourne bed bug treatment page. The licence number behind the work is 86488, issued in Victoria; the business carries full insurance; and Tim turns up to every job himself instead of passing it on. There is a guarantee behind covered work too: the same pest active again inside three months in a room he has treated means a free return visit. You can send him the details and book a visit, or read the full walkthrough on what clearing them actually involves first.
Can bed bugs be in a home with no signs at all?
A very new arrival can leave almost nothing behind, because a single insect that has fed once or twice produces little spotting and no skins or eggs yet. That is the window where a trip home from a hotel is worth a check even though nothing is obvious. Once a population has been running for a few weeks, it always leaves something, which is why a careful search that finds nothing is genuinely reassuring.
Questions
Questions people ask about the signs
What is the very first sign of bed bugs?
For most households it is marks on somebody's skin, which is unfortunate because that is the least reliable sign there is. The first dependable sign is dark spotting along the piping at the head end of the mattress, which is also the easiest one to find deliberately with a torch.
How do I know it is not fleas or mosquitoes?
By what the room shows rather than the skin. Fleas bite low on the legs and usually come with a pet; mosquitoes are seasonal and audible; bed bugs leave spotting, husks and eggs around the bed. Search the bed properly before treating anything for anything.
I found black dots on my mattress. What are they?
Touch one with a damp cotton bud. Digested blood bleeds rust-red into the bud and stays slightly raised on the fabric, while ordinary grime smears grey or black and brushes off dry. That single test separates a genuine find from a dirty mattress more reliably than anything else you can do at home.
How quickly do I need to act?
Within days rather than weeks. Eggs are laid steadily and hatch over a fortnight, so each week of waiting adds insects and usually adds places they are living. The gap between a single bedroom and a whole home is commonly just a few weeks of delay.
Can I just wait and see if it gets worse?
It will get worse, and the cost rises with it, because the price of the work tracks how many rooms are involved and how much furniture is in them. Waiting also tends to mean more product bought, more scattering and a harder inspection when somebody finally looks.
What information is worth writing down before I call?
Keep a short dated list: what you found, the precise spot, and which room. Add any recent trip away, any furniture that came into the house second-hand, and a note of every product used so far. That last item matters most, because a room already sprayed is searched differently.
Found something and not sure what it means?
Send Tim a photo with the room it came from and your suburb, and you will get a straight answer on whether it needs treating.
Reviewed October 2026 by Tim, licensed pest control operator (Victorian licence No. 86488). Sources: the Better Health Channel on bedbugs and Consumer Affairs Victoria on renting.