Bed bugs | DermNet

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What is a bed bug?

The bed bug, Cimex lectularius, is a blood-sucking human parasite that is found worldwide. Bed bugs come from the insect family Cimicidae. The bed bug is oval shaped, flat, reddish brown, and up to 5 mm long. Immature bed bugs are smaller than adults and may be translucent to light yellow.

Bed bugs

Bed bugs are attracted by warmth and generally feed at night. They can survive for long periods (e.g. up to one year) without feeding. In developed countries, bed bugs often hide in the cracks and crevices of mattresses, bed frames, and other nearby structures. They can travel in furniture, luggage, and clothing, or can migrate through holes in walls, water pipes, or gutters. In developing countries, bed bugs can be found in the cracks and crevices of the walls of mud houses, as well as thatched roofs. Reports of bed bug infestations appear to be increasing in homes, apartments, hotel rooms, hospitals, and hostels in developed countries. This may be due to increased international travel, immigration, and insecticide resistance.

There is currently no scientific evidence that bed bugs can transmit other human diseases, although there is a debate on whether they are implicated in Hepatitis B and Chagas disease transmission.

Bed bugs usually feed without detection by the host, although some people with bed bug infestations report a restless night's sleep. Bed bugs generally bite in a linear pattern (a line) on exposed areas of skin such as the face, neck, hand, and arms. Most patients do not experience a reaction to a bed bug bite, and the only evidence is a tiny punctum (hole) at the site of the bite.

When a reaction occurs, the lesions are most commonly 2 to 5 mm red, itchy bumps. If they are not scratched they usually resolve in a week or so.

Some people experience significant skin reactions to the bites including:

These reactions may evolve into a bullous rash (fluid-filled blisters) and may become complicated by secondary bacterial infections such as impetigo or cellulitis.

Systemic reactions that have been rarely associated with bed bugs include asthma and anaphylaxis.

Bed bug bites

Treatment is not generally required. However, various treatments may relieve the symptoms of bed bug bites:

Firstly bed bugs must be correctly identified. A thorough search of the cracks and crevices of the bed and surrounding areas should be undertaken to detect the easily visible bed bugs or their faecal matter.

Eradication of bed bugs can be difficult and requires chemical and non-chemical control strategies. Hire a licensed professional pesticide applicator with experience in treating bed bugs.For further details, refer to the links in our Related information section below.

Once clear of bed bugs prevent recurrence by enclosing mattress and pillows, removing clutter, and reducing hiding places for the bugs. Each bed leg or caster can be placed in a container of talcum powder or wrapped in adhesive tape (sticky side out) to act as a barrier to the bugs.

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Bed bugs | DermNet

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