Bedbug Bites
Itchy bites from small night-feeding insects that hide near beds
Quick Facts
- Type: Insect bite reaction
- Cause: Cimex bedbugs
- Typical pattern: Lines or clusters of itchy welts
- Disease risk: Bedbugs are not known to spread disease
Overview
Bedbugs are small, flat, reddish-brown insects that feed on the blood of people and animals, usually at night. They hide during the day in mattress seams, bed frames, furniture, and cracks in walls, then come out to feed while you sleep. Their bites can cause itchy red marks on the skin, although some people react very little or not at all.
Bedbugs are not known to spread disease to humans, so the main problems they cause are itching, disturbed sleep, and the stress and effort of clearing an infestation. They are not a sign of poor hygiene and can appear in clean homes, hotels, and other places where people gather.
Because bedbugs are skilled at hiding and can survive for long periods between meals, infestations can build up before anyone notices the bites. Recognizing the signs early, treating the reaction on the skin, and addressing the infestation in the home together give the best results.
Symptoms
Bite reactions vary from person to person. They often appear within a day or two and may include:
- Small, red, raised welts that are usually very itchy
- Bites arranged in a line or a loose cluster, often on the arms, legs, neck, or other skin exposed during sleep
- A small dark center or, in some people, a tiny blister
- Occasionally a larger area of swelling and redness
Scratching can break the skin and lead to a secondary infection. Rarely, people have a more severe allergic reaction. Other signs of bedbugs include small bloodstains or dark spots on bedding and a sweet, musty odor in heavy infestations.
Causes
Bites are caused by bedbugs (mainly Cimex lectularius) piercing the skin to feed on blood. The itching and redness come from the body's reaction to substances in the insect's saliva.
Bedbugs spread by hitchhiking on luggage, clothing, used furniture, and bedding. Infestations commonly start after travel or after bringing secondhand items into the home. They move easily between rooms and apartments, which is why infestations can be hard to control.
Risk Factors
- Recent travel and overnight stays in hotels or hostels
- Living in apartments or shared housing where bugs can move between units
- Buying or accepting secondhand furniture, mattresses, or bedding
- Having guests or visitors from places with infestations
Diagnosis
There is no specific test for bedbug bites; the diagnosis is based on the pattern of bites and evidence of bedbugs:
- Skin examination: Looking at the appearance and arrangement of the welts.
- Finding the bugs: Inspecting mattress seams, bed frames, and furniture for live insects, shed skins, or dark fecal spots.
- Ruling out other causes: Bites can resemble those of fleas, mosquitoes, or scabies, so the setting and pattern help distinguish them.
Treatment
Bedbug bites usually heal on their own within one to two weeks. Treatment focuses on relieving the itch and clearing the infestation.
- Soothe the skin: Wash the bites with soap and water and apply a cool compress. Over-the-counter anti-itch creams (such as hydrocortisone) and oral antihistamines can ease itching.
- Avoid scratching: This helps prevent infection and scarring.
- Treat infection: If a bite becomes increasingly red, warm, swollen, or starts oozing, see a doctor, as antibiotics may be needed.
- Eliminate the infestation: Wash and hot-dry bedding and clothing, vacuum thoroughly, reduce clutter, and often involve a professional pest control service, since bedbugs are difficult to remove completely.
It can take more than one treatment to clear an infestation fully, so following through with all the recommended steps is important.
Prevention
- When traveling, inspect mattress seams and headboards and keep luggage off the bed and floor
- Wash and hot-dry travel clothing soon after returning home
- Inspect secondhand furniture and mattresses carefully before bringing them indoors
- Use a protective mattress encasement to make inspection and control easier
- Reduce clutter where bedbugs can hide and address any infestation promptly
When to See a Doctor
See a doctor if bites become very painful, spread, blister, or show signs of infection such as increasing redness, warmth, swelling, or pus. Also seek care if itching is severe or interferes with sleep despite home measures.
Seek emergency care for any signs of a severe allergic reaction, such as widespread hives, swelling of the face, lips, or throat, or difficulty breathing.
Frequently Asked Questions
Do bedbugs spread disease?
Bedbugs are not known to transmit disease to humans. The main problems they cause are itchy bites, disturbed sleep, and the difficulty of clearing an infestation. Scratching can occasionally lead to a skin infection that needs treatment.
How can I tell bedbug bites from other bites?
Bedbug bites are often itchy red welts arranged in a line or cluster on skin exposed during sleep. Finding live bugs, shed skins, or dark spots on the mattress and bed frame, especially after travel or new furniture, helps confirm them over flea or mosquito bites.
Are bedbugs a sign of a dirty home?
No. Bedbugs feed on blood, not dirt, and can appear in clean homes and hotels. They spread by hitchhiking on luggage, clothing, and used furniture, so an infestation is not a reflection of cleanliness.
How do I get rid of bedbugs?
Wash and hot-dry bedding and clothing, vacuum thoroughly, reduce clutter, and use mattress encasements. Because bedbugs are hard to eliminate completely, professional pest control is often needed to treat the home effectively.
When should bites be checked by a doctor?
See a doctor if a bite becomes increasingly red, warm, swollen, or oozes, which may indicate infection. Get emergency care for signs of a severe allergic reaction such as facial or throat swelling or trouble breathing.
References
- Centers for Disease Control and Prevention (CDC). Bed Bugs.
- Mayo Clinic. Bedbugs.
- U.S. Environmental Protection Agency (EPA). Bed Bugs.
- MedlinePlus, U.S. National Library of Medicine. Bedbugs.