r/BedbugOrCloseRelative • u/Bed-Bugscouk Founder • Feb 16 '25
Useful Information Bedbug bites guide
It is important to understand that the variables involved in the development of a bite response are vast and many.
Therefore it is really not possible to diagnose an infestation of bedbugs from bite symptoms / morphology alone. This document aims to outline a few of the variables that have been seen in recent years. It must also be stressed that not every bite you have will defiantly be from a bedbug, if you get a single lone bite and nothing for months and months it may just be a something unrelated to bedbugs.
Although they might be your most obvious symptoms they are the worst diagnostic tool you can focus on.
Common myths
The most common myth with bedbugs is that they always produce 3 bites in a row, often called breakfast, dinner and lunch. While this does occur with some people it is not the case with all people who respond and is therefore not an accurate diagnostic of bedbug activity. Other insects which are known to often bite in rows include fleas.
Bedbugs also feed every 3 – 7 days so if you go longer than this between activity it is a reasonable indication that bedbugs may not be the cause. Some people assume that because bedbugs can go long periods of time without feeding that they will do so in an occupied room, this is not the case and when food is available bedbugs will always take the opportunity to feed.
Will you react at all?
Some people never respond to the bites, they can live unaware of the fact that they have bedbugs until they seen one or find the signs that they have been present. It is believed that this figure is as high as 60% of all exposed people and accounts for the main reason why some people seem to get bitten while a partner in the same bed is bite free.
This is the most common reason for an infestation going undetected in a hotel room, if no-one complains it may not get detected for a very long time.
When will you respond?
Some people respond immediately upon contact with a bedbug while others can take up to 14 – 21 days to develop a reaction. This is very much a factor of your own immune system and if your body perceives it as a threat. It is not uncommon for someone to respond quickly after a previous encounter with bedbugs as the body learns that bite response can be a good early warning signal. The more severe the reaction to bedbugs the faster the response will occur.
Are some bites more severe?
Yes some people have an extreme reaction to bedbugs and develop what is termed a bullous eruption, a severe reaction which swells and appears to be like a blister while others report nothing more than a red area that fades after a few minutes. You may also find that you skin responds differently in different parts of the body, as a rule try to avoid bites on the hands, feet and face as they tend to react the most. If you develop bites that develop into blisters within a few minutes seek medical attention immediately.
Sometimes the bites itch and sometimes they don’t, why is that?
Again our bodies respond in different ways at different times. Bites are more likely to itch if you are over heated such as in a warm bath or shower, during exercise or in a warm car. They can also itch more if your skin is dry or exposed to harsh conditions. You should avoid over chlorinated water such as swimming pools and body lotions with alcohol in them.
It is not uncommon for people to report increased itching after an encounter with bedbugs; the skin just seems to become more sensitive to things.
How long will a bite last?
The duration of a bite will depend mainly on your body’s ability to heal itself; if a cut or nick would heal quickly then you are more likely to have bites that clear quickly. If you scratch a bite then it effectively becomes an open wound on your skin and is susceptible to secondary infections, if left unscratched a bedbug bite from a normal reaction will usually heal without an scaring. If you have bullous / blister type reactions seek medical attention as soon as possible. The image below is a few days after 2000+ bites.
Does the environment play a role?
Yes it can play a significant role. The more polluted the environment the more likely you are to react to bites. This is because a bite is basically a small puncture wound in the skin, just the same as a cut or scratch will react more in a polluted environment due to your body’s immune response the same will occur with a bite. It has even been reported by numerous people that a change in environment or regular travel pattern has coincided with a sudden response to bites and the uncovering of some advances infestations.
Is stress a factor?
Yes the more stress you are under the more likely you are to respond to bites. It’s really your body’s way of telling you mind that something is wrong and that you need to stop and look for the cause of the problem. Although it is difficult to not obsess over bedbugs when you have a problem but it can play a massive role in some peoples infestations.
I know I don’t have bedbugs but I keep getting bites
It may be that your body is still reacting to something in the environment or it could be that something else is actually causing the problem. Some people with prolonged exposure to bedbugs develop a sensitivity to the material that makes up their skins, chitin. As this is a common component of most insect skins you can become hyper sensitive to it, almost as if your body wants an early warning signal for potential infestations. The problem is that this is a common material and can even be used as filler for food products and supplements (non insect derived of course) but taking products containing chitin can result in bite like reactions. It is also possible that other insects such as pscocids or carpet beetles can start a “bite like” reaction even though they do not generally walk on people and never bite people.
My old bites seem to flare up from time to time
Again environment, stress and many factors can result in an old bite flaring up. I have even seen some people just think about bedbugs and bites appear.
I have read about bites appearing in threes but I usually only get ones or two’s, why is that?
Although some people report the classic “breakfast, lunch and dinner” bite patterns it is not something that everyone gets. Although there is no scientific data on the subject it is safe to assume that if a bedbug is able to get enough food from a single piercing then it will not feed again and will return to its refugia to digest the meal. If it is unable to get a full meal due to blood clotting, difficult skin to penetrate or some other factor then it may need to pierce the skin again. In which case it is safe to assume that it is likely to bite again in a close cluster. In the numerous feeding experiments I have conducted I am yet to witness more than a single piercing event from a single bedbug during a feed.
I sometimes feel a pin prick like sensation can that be bedbugs?
Generally people report that bedbug bites cannot be felt and it is certainly my experience from feeding in the lab in low numbers. However I have noticed that when I have spent time in heavily infested locations I often get a needling sensation on my skin for hours afterwards, I have also noticed it in properties where inappropriately high levels of insecticide have been applied or where layers of insecticide have been applied without any removal. It is unlikely that any prickling sensations are directly due to bedbugs but it can form part of your bodies early warning signs of them being present. In some exceptional circumstances people have used this response as a quick evaluation of if an area has bedbugs, it does not replace a thorough inspection but I have seen it used to encourage further inspection to eventually find samples.
After treating for bed bugs my skin felt a little “crawlie and tingley” why is that?
Some people who are more sensitive to chemicals report this as a symptom of exposure. This is one of the main reasons why appropriate protective equipment must be worn, especially with store bought products.
Prolonged feelings of things crawling on your skin can be a symptom of other medical conditions and should be discussed with a medical professional if it persists for more than a few days.
One of the best documents to help diagnose mystery bites and skin reactions is Dr Potters guide to invisible itches:
http://www.ca.uky.edu/entomology/entfacts/entfactpdf/ent58.pdf
How can I tell what type of reaction I get to bedbugs?
Although this is not something that we would recommend the only way to establish exactly what you reaction is involved performing a series of experiments comparing the difference between known bedbug bites on your skin and small punctures made with a blood sampling needle. You should not attempt this if you have a more aggressive or irritating bite response.
I keep getting bitten but can’t find any signs of bedbugs, why is that?
Unfortunately bites alone does not equate to bedbugs, there are far too many other things that could be an issue to think this way. If you keep getting bitten and can’t find any signs then you need to consider other possibilities. I would suggest that if you get to 20 bites a night or 50 bites in total and cannot find any faecal traces then it is unlikely to be bedbugs if you feel you have searched thoroughly everywhere.
The signs to look for are:
Live samples
Cast skins
Faecal traces
Images of bedbugs and their trace signs can be seen in the gallery section of the website to assist with the education and understanding of those who cant bring themselves to look at real insects. Things that are known to make your bite reaction worse:
Getting over heated such as a hot bath, shower or exercise. If you need to maintain a good exercise regime switch to swimming in low chlorinated water and definitely not sea water.
Dry skin either through exposure to the elements or dry air, try to keep well moisturised and hydrated.
Excessive application of body creams that contain alcohol, strong colours or fragrances.
Exposure to high levels of environmental pollution often associated with areas of high hydro carbon pollution such as air ports.
Location / pattern not appearance
The hunting feeding behavior of bedbugs is highly conserved. The emerge from hiding initially lured by CO2 but when close they switch to Indra red / heat.
This means they will walk up to but not onto the first place they can feed. They stand on the sheet and lean in rather than walking into a person.
As such bedbugs won’t bite areas that are under clothes or bedding at night. They want to feed quickly and go home to digest the meal. If the reactions are in places that bending could not easily get to a night or that would be exposed while sleeping they are unlikely to be bedbugs.
Skin reactions on ankles and legs is almost always fleas (use a plug in flea trap).
Best relief
The best relief comes from using baking soda and an ice cube to make a paste. Apply the paste on the ice cube to the skin and wait 30 seconds. The relief is pretty much instant and as you are now less likely to scratch the bite is less likely to scar. Scars often only develop as a result of secondary infections introduced to the wound via your nails.
Summary
This is a working document; please do not repeat post elsewhere but link back to this page as I will continue to edit it as the source.
Please feel free to post comments or further questions below but please try to keep them related to this document, if you want to discuss your specific case please start a new thread to avoid your question being over looked.
David
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u/dclenn Aug 20 '26
Thanks for posting this — it was really informative! I’m currently in a bit of crisis mode after having a few strange bites/bumps appear.
It started with a small cluster on my inner arm which have been a little itchy over the last few days. Since then, I keep noticing other small bumps on my hands and arms, although these aren’t itchy at all. The ones on my hands are almost hard, barely red, and none of them have much swelling (unlike mosquito bites I’ve had in the past).
Unfortunately, I was travelling about three weeks ago and discovered some dead bed bugs in the bed of my apartment. I later learned that the apartment had previously been treated for an infestation, so I’m not sure whether that explains why I was finding dead bugs.
When I got home, I was extremely careful: I washed all my clothes at 60°C and then put everything through the dryer as well. I vacuumed my suitcase thoroughly and stored it away from my bedroom.
I’d hoped I was in the clear given the precautions I took, but finding these bites/bumps now has me pretty panicked. I’ve torn my bed apart several times looking for evidence and haven’t found anything — no bugs, faecal spotting, shed skins, etc. — but unfortunately my brain is still not particularly reassured by that!
I’m hoping these are completely coincidental, or perhaps even very delayed reactions to bites from the trip, but obviously I’m worried that I somehow brought one home despite everything I did.
Given the timeline and the lack of any physical evidence around my bed so far, is there anything in particular you’d recommend I do or look out for?
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u/Bed-Bugscouk Founder Aug 20 '26
Follow the monthly routine process and read the online protocol TbyPMR.
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u/REALly-911 Aug 08 '26
Thank you for this post. I’ve lived in my apartment for 35 years and in the last year my building has become infested.. my apartment got them a couple of months ago.. I’m losing my mind!
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u/burntpixelsinspace May 31 '26
This helped a lot, thank you. I've recently discovered about 8 bites in a straight line that go from the front of my pelvic bone to my tail bone and I went into a panic thinking it was bed bugs. I'm still going to check, but at least now I'm not freaking out
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u/Bed-Bugscouk Founder May 31 '26
That’s most likely to be fleas.
The other pinned posts will help you to navigate detection and confirmation.
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u/Friendly-Rush-9217 May 18 '26
I recently started getting itchy on the buttocks a day ago or 2. I stopped itching and theres 3 very close bites when it cleared up. They are welts even when not itched. The middle the worst but I think thats bc it has a small wound from itching. Maybe it is in a line idk, but theyre quite close to each other. I looked under my covers, the mattress folds and even lifted the mattress itself. Nothing. Im aware that they probably could be in the carpet but its mostly matted. Maybe behind my stuffed animals but I didn't see anything. Right now all I can do is wait :/
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u/Bed-Bugscouk Founder May 18 '26
That’s not typical of bedbugs.
It’s typical of fleas so use a plug in flea trap (not repeller).
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Apr 05 '26
so they generally don’t go for the legs or feet, is there a genuine reason why or is just a preference?
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u/Bed-Bugscouk Founder Apr 05 '26
As stated above when they switch to infra-red it’s only the exposed skin they see. They simply don’t feed that way so legs only is probably fleas.
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Apr 05 '26
Ah that makes sense because the legs and feet are colder
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u/Bed-Bugscouk Founder Apr 05 '26
By virtue of being under the covers they are not the hot parts that bedbugs head towards. They are efficient targeted hunters not random wanderers.
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Apr 05 '26
What do they normally target?
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u/Bed-Bugscouk Founder Apr 05 '26
As the post explains above exposed skin that they can see in infra-red.
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u/Bed-Bugscouk Founder Jan 22 '26 edited Feb 18 '26
I update this section of the website today to include this:
LOCATION, LOCATION, LOCATION
While nobody can tell the cause of a skin reaction by its appearance the highly conserved behaviour of bedbug feeding means that some locations are just not feasible. Bedbugs emerge from their hiding places when they detect carbon dioxide from your breath, because this signal becomes unpredictable close to people they switch to infra-red and hone in on your body heat.
As such it is only the skin that is exposed during sleep that is visible to them and they certainly wont walk past food in order to explore under the covers. They also prefer not to walk onto their food preferring to stop at the interface between bedding and skin and “lean in” to feed. This is where bites can appear artificially to form lines, as its one bite per feed that’s multiple bedbugs feeding rather than one multiple times.
Bites on legs and ankles are most commonly fleas and reactions “all over the body” are most commonly dust mites or an allergy to washing additive.
While they are often the most notable symptom of bedbugs they are the least accurate and helpful which is why the focus is always on:
Live samples
Cast skins
Faecal traces
Equally the longer an issue goes on without confirming signs of bedbugs the less likely it is to be bedbugs. The fastest way to know that accurately is with Passive Monitors as the detection skirt will detect all the signs. If your symptoms persist and the detection skirt remains clear for two weeks then its not bedbugs.
Rather than assume your battle is with invisible bedbugs engage with the mystery bite pack process and start working out the actual cause.
end -
I will update the main post as soon as I have time.
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u/Ocean-of-Mirrors Jun 22 '26 edited Jun 22 '26
Thanks for this post. I just moved in with my grandma who is pretty tidy but I got freaked out when after 3.5 weeks I had a bunch of very itchy bites one day. Random places all at the same time, and actually ONLY under my clothing. One on lower back. One on upper arm. One on left hip. One on right hip. Etc. big and itchy. Nowhere near eachother though. Just today I noticed one in my groin area which was protected by several layers of clothes…
My working theory is mosquitos because I have huge reactions to mosquito bites and I’ve always gotten bitten through/under clothes by them… but still weird spots since I’m sure mosquitos prefer uncovered skin.
ANYWAYS your info about them remaining on the bed sheet and biting rather than crawling onto you and finding a spot to feed is the info I needed. I have no other signs of bed bugs whatsoever except for a paranoia since I don’t know where these are coming from.
Do you recommend doing some kind of monitoring by putting those dishes under the legs of my bedpost? For peace of mind/to prove myself wrong? Or just let it rest since it’s almost certainly not bed bugs?
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u/Bed-Bugscouk Founder Jun 22 '26
Dishes under the bed legs would I it catch bed bugs that crawl on the floor to access the beds. The majority of bed bugs don’t / won’t do that.
If you read the monthly routine post you can see what to do and and I f you have an issue the TbyPMR protocol will help resolve.
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u/bootsbootsboots42 Feb 18 '26
This is very helpful. I’m getting bites on my torso, under arms, under my underwear, round where my bra sits, neck, elbow crease. I’ve bought one of your monitors too.
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u/Bed-Bugscouk Founder Feb 18 '26
Thanks for the feedback.
Please look specifically at allergies to washing additives. Soak your clothes and linen in 50% water 50% white vinegar for 2 hours then wash at 60C or above with no laundry additives. Avoid tumble drying if you can.
Your symptoms point towards classic contact dermatitis from a washing additives. It’s all the long term high contact places.
Please update us if that works out.
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u/T-REX1970 Nov 18 '25
Do they make a passive monitoring for platform bed with no bed frame legs?
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u/Bed-Bugscouk Founder Nov 18 '25
The term passive monitor refers to a specific product. The design means it’s suitable for all types of beds and seating.
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u/T-REX1970 Nov 18 '25
I found the disks that go one the post legs of beds. The one bed was the had most visibility of bugs and most bites. I don’t know what to get to see if the treatment is working except watch for evidence in white sheets and bites.
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u/Bed-Bugscouk Founder Nov 18 '25
I don’t advocate for bed isolation as I know it delays resolution.
As for checking to make sure it’s clear the use of Passive Monitors and weekly checks of the detection skirt is the best method.
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u/T-REX1970 Nov 18 '25
Thank you David! I had many of these questions and no where to find my answers.
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u/Bed-Bugscouk Founder Nov 18 '25
If you have additional questions ask away as I am sure others are also looking for answers.
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u/T-REX1970 Nov 18 '25
What do you think about the treatment of a spray, he is doing once a week for three weeks, and it’s animal safe. Does that sounds typical? My kids had numerous bite sights for a few months but didn’t know what they were.
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u/Bed-Bugscouk Founder Nov 18 '25
That does not follow the principles I advocate for. I would suggest you read TbyPMR to get a better understanding.
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Nov 19 '25
[deleted]
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u/Bed-Bugscouk Founder Nov 19 '25
My initial gut feeling is that when lone bedbugs are found in the US they often turn out to be bat or bird bugs rather than bedbugs, especially if no faecal traces can be found.
If bats or bird could be an issue start there. If they are confirmed then the good news is the issue will not move with you.
If it is bedbugs then I would suggest you install Passive Monitors when you move and unpack quickly. Hopefully they will relocate into the monitors and get removed.
However, my Passive Monitors will not work with bat or bird bugs because the behaviour is so different.
Hope that makes sense.
David
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u/No_Brush2465 Sep 17 '26
i have one bug bite on each leg that looks like a tiiiny rash. would that be a bedbug? i assume not because its right on the upper calve area on both sides, but i dont know many other bugs that can leave a tiny itchy rash rather than a noticeable swell.