Hives can sometimes resemble bed bug bites, as both can result in raised bumps on the skin. However, they have unique features that can assist in their identification.
Hives typically have more irregular edges, while bed bug bites often appear more uniform. When pressed, hives tend to blanch, whereas bed bug bites remain the same color. Furthermore, hives often resolve quickly, whereas bed bug bites may take a few days to heal. Additionally, a careful examination of bedding can assist in identifying bed bugs.
In this article, we will discuss in detail hives versus bed bug bites, including their appearance, identification, causes, and treatment options.
What are they?
Hives, also known as urticaria, are raised welts that can appear due to several causes. Although some may resolve very quickly, the chronic type may last longer.
Bed bug bites, on the other hand, are a type of rash that appears due to a skin reaction to bites by bed bugs. Not everyone who gets bed bug bites will have entirely the same symptoms. Some will have a more pronounced reaction, while others will have no or very mild reactions.
Read more: Hives vs rash
Appearance
Shape and size
Hives present as raised bumps that can be small or large, and are circular, oval, or irregular in shape. They often change shape and size, and their edges are typically irregular. Sometimes, you may see a flush or redness surrounding the bumps. They may coalesce to form large areas of raised skin, known as plaques.
In contrast, bed bug bites are small, with a uniform size, and often line up in a row or cluster due to the bed bug’s feeding habits.
Color and texture
Hives can be red or skin-colored, presenting as smooth, slightly raised areas. They might feel firm to the touch. Bed bug bites usually appear as a bright or dull red, often with a central, darker red spot where the bug has bitten.
Blanching
Hives are blanchable, meaning if you press them, they turn pale or white. Bed bug bites, on the other hand, are non-blanchable and show minimal change when pressed, retaining their color.
Pattern and distribution
Hives can erupt anywhere on the body and often appear and disappear quickly in various places. Conversely, bed bug bites are more likely to occur on exposed skin during sleep, such as the arms, legs, face, and neck.
Pictures
The picture below shows how hives can merge together to form large red raised areas, in contrast to bed bug bites.
The picture below shows skin-colored hives, in comparison to bed bug bites which are often reddish. Additionally, a red mark is visible at the center of the bed bug bites.
The picture below shows the linear pattern of bed bug bites, as opposed to the more random distribution of hives.
Associated symptoms
Itching and discomfort
Hives are known for causing intense itching, which can be almost immediate and quite severe. They can also cause a burning or stinging sensation.
Bed bug bites can also lead to itching that develops over time (a few days after the bite), with some people experiencing more severe symptoms depending on their sensitivity to the bites.
Duration and evolution
Hives often resolve spontaneously within 24 hours, though new hives can appear as old ones fade. Hives can be divided into acute or chronic types, depending on how long they last: acute hives last less than 6 weeks, while chronic hives last more than 6 weeks.
Bed bug bites might not be immediately noticeable; symptoms can appear days after the bite and persist for a week or more. The reaction time can vary depending on an individual’s immune response to the bites.
Severe symptoms
Hives may sometimes be associated with angioedema, which, if it affects the airways, can be serious. Occasionally, they may be associated with a serious allergic reaction called anaphylaxis, which can present with swelling of the tongue, throat, and airways, difficulty breathing, chest tightness, wheezing, low blood pressure, rapid pulse, nausea, vomiting, diarrhea, feeling tired, dizziness, or confusion.
Bed bug bites may also be rarely associated with anaphylaxis.
Causes and triggers
Hives
These often result from an allergic reaction to food, medication, insect stings, or infections. Physical triggers like heat, cold, vibration, or pressure can also cause hives. Stress and certain autoimmune conditions are known to provoke hives in some individuals.
Read the article on hives, which goes into detail about the types of hives and underlying causes.
Bed bug bites
These result from bites by bed bugs, which feed on human blood and are attracted by warmth and carbon dioxide. The rash is our body’s reaction to the bed bug bites. In some cases, the bites can result in an allergic reaction leading to hives, and in some cases, a severe allergic reaction like anaphylaxis.
Diagnosis
Hives
Diagnosing hives involves a physical examination of the skin lesions. Additionally, a detailed medical history is required to identify potential allergens or triggers. In some cases, allergy testing or blood tests may be recommended to rule out underlying conditions.
Bed bug bites
Besides checking for physical signs of bites, it’s important to inspect sleeping areas for bed bugs or their droppings.
Some of the common signs include blood smear marks on the bedding, shed outer shells, adult bed bugs, immature forms or their eggs, and bed bug droppings (which appear as small black dots).
One should examine the mattress, paying close attention to the underside, seams, comforters, zippers, corners, headboards, and other upholstered items.
The picture below shows the three stages of bed bugs: eggs, nymphs, and adult bed bugs.
If there is any doubt, professional pest control services can provide a thorough evaluation, which can help in identification.
Read more about how to check for bed bugs here.
Treatment
Hives
Mild symptoms can be controlled with antihistamines. For severe cases, a short course of steroids can be recommended. Chronic cases may benefit from prescription medications such as leukotriene receptor antagonists or omalizumab.
In addition, lifestyle changes and avoiding known triggers are important in managing hives.
Bed bug bites
Treatment for bed bug bites is usually symptomatic, with antihistamines to control itching. If bites become infected, antibiotics may be necessary.
Additionally, it’s important to treat infested areas to prevent future bites. This includes using heat or steam, cold treatments, vacuuming the area, washing all infested items or bedding in hot water, and drying on high heat for at least 30 minutes.
Pesticides meant for bed bug control can also be helpful. However, it can be very difficult to control or get rid of bed bugs, so consulting a professional pest control company is advisable.
Read more about methods to get rid of bed bugs here.
Note: If your hives or bed bug bites are associated with anaphylaxis, it is important to get immediate medical attention. Call the emergency room, and if you have an epinephrine auto-injector, it may need to be used.
If you experience multiple episodes of anaphylaxis, it is important to follow the instructions given by your doctor during any episode.
Takeaway
Correctly identifying whether a skin condition is due to hives or bed bug bites is important for appropriate management. Always consult a healthcare provider for persistent or severe symptoms to ensure a proper diagnosis and treatment plan.
References
- Kayiran MA, Akdeniz N. Diagnosis and treatment of urticaria in primary care. North Clin Istanb. 2019 Feb 14;6(1):93-99. doi: 10.14744/nci.2018.75010. PMID: 31180381; PMCID: PMC6526977.
- Godse KV. Chronic urticaria and treatment options. Indian J Dermatol. 2009;54(4):310-2. doi: 10.4103/0019-5154.57603. PMID: 20101328; PMCID: PMC2807703.
- Doggett SL, Dwyer DE, Peñas PF, Russell RC. Bed bugs: clinical relevance and control options. Clin Microbiol Rev. 2012 Jan;25(1):164-92. doi: 10.1128/CMR.05015-11. PMID: 22232375; PMCID: PMC3255965.
Disclaimer: This article is for information purposes only and does not replace medical advice.