insect bite and sting
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What is an insect bite or sting?
An insect bite or sting is a break or puncture of the skin caused by an insect, complicated by the introduction of saliva, venom, or excretory products into the skin. These substances can cause an allergic reaction, resulting in skin lesions ranging from small, itchy wheals to large areas of inflamed skin covered by vesicles and crusted lesions.
Flying insects like flies and mosquitoes typically cause a single, itchy wheal, while crawling insects can cause skin diseases. Stinging insects inject toxins, leading to painful swelling, with the severity varying by insect and sting location. In rare cases, a severe allergic reaction called anaphylaxis can occur. The worker bee's barbed sting injects venom and should be scraped off to minimize venom injection.
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Which insects commonly bite or sting humans?
Insects that commonly bite include flies, gnats, mosquitoes, fleas, bedbugs, lice, and chiggers. These bites result in itchy wheals, red spots, or clusters of papules on the skin.
Stinging insects, such as bees, wasps, hornets, some ants, centipedes, scorpions, and spiders, can produce painful swelling. Some stinging insects, like bees, may leave their stinger in the wound. In rare cases, stings can cause severe allergic reactions like anaphylaxis, and multiple stings or bites from certain spiders can lead to systemic symptoms or even death, especially in young children.
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How do insect bites and stings affect our bodies?
Insect bites and stings can trigger various reactions in the human body, ranging from mild irritation to severe allergic responses. When insects bite or sting, they break the skin and introduce saliva, venom, or excretory products. These substances can cause allergic reactions, leading to skin lesions like small, itchy wheals or large, inflamed areas with vesicles and crusted lesions.
Flying insects typically cause a single, itchy wheal that subsides within hours, while crawling insects can cause skin diseases characteristic of each insect. Stinging insects inject toxins that cause painful swelling, with the severity depending on the sting's location and the insect involved. In some cases, a second sting from bees or wasps can cause a severe allergic reaction known as anaphylaxis. Some insects, like bees, may leave their stingers in the wound, continuing to inject venom. Multiple stings can lead to severe systemic symptoms and, in rare instances, death.
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What symptoms might someone experience after being bitten or stung by an insect?
After an insect bite or sting, a person may experience symptoms that range from mild to severe, depending on the insect and the individual's reaction.
Common symptoms include:
* Immediate, intense pain at the site of the sting or bite
* Itchy wheals, or slightly elevated areas of the skin
* Reddening around the affected area, which may spread an inch or more
* Swelling, which may not become apparent until the following dayIn severe cases, a person may experience an allergic reaction known as anaphylaxis, with symptoms such as difficulty breathing, heart irregularity, shock, splotched skin, and speech difficulty, requiring immediate medical attention.
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How can people treat and care for insect bites and stings?
Insect bites and stings can cause a range of reactions, from minor itching to severe allergic reactions. For mild reactions, washing the area with soap and water is generally recommended. Applying a cold compress can help reduce swelling and pain. Over-the-counter antihistamines or topical corticosteroids may relieve itching.
However, some insect stings can cause a severe allergic reaction known as anaphylaxis. Allergy desensitization, a treatment involving a series of injections with graded strengths of the substance a person is sensitive to, may help to eliminate allergic reactions to insect bites.
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What steps can be taken to prevent insect bites and stings?
To prevent insect bites and stings, reduce exposure by avoiding brush and tall grass, and walk in the middle of trails. Use insect repellents on skin and clothing, and treat clothing and gear with permethrin. Wear light-colored, long-sleeved clothing, tucking pants into socks to reduce exposed skin and spot ticks easily. After being in insect-prone areas, check your skin and clothing for ticks. If stung, scrape the stinger loose immediately to prevent more venom from entering the body.
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insect bite and sting, break in the skin or puncture caused by an insect and complicated by introduction into the skin of the insect’s saliva, venom, or excretory products. Specific components of these substances are believed to give rise to an allergic reaction, which in turn produces skin lesions that may vary from a small itching wheal, or slightly elevated area of the skin, to large areas of inflamed skin covered by vesicles and crusted lesions. This article encompasses similar wounds inflicted by other small invertebrates, particularly arachnids (spiders, scorpions, ticks, mites, and their allies).
Flying insects, such as flies, gnats, and mosquitoes, attack exposed body parts, each bite resulting in a single itchy wheal that generally subsides within hours. Crawling insects may reach any part of the body, including the covered areas, and are more likely to remain there, generating skin diseases characteristic of each insect. Scabies, or sarcoptic itch, designates the skin inflammation brought about by the itch mite, Sarcoptes scabiei. The female mite burrows beneath the superficial layer of the skin to lay its eggs in a tunnel that can be seen as a dark wavy line. This initial lesion becomes intensely itchy after a few days to about a month, and the scratching leads to secondary skin lesions consisting of papules (solid elevations), pustules, and crusted skin areas. The itchiness is believed to be caused by the accumulation of fecal deposits by the mite in the burrow region. Scabies is most commonly noted on the webs between the fingers, other frequent locations being the natural folds of the skin and pressure areas.
Pediculosis is the skin disorder caused by various species of bloodsucking lice that infect the scalp, groin, and body. The lice live on or close to the skin and attach their eggs to the hair or clothing of the host, on which they periodically feed. Their bite results in a small red spot that is extremely itchy and may become infected after repeated scratching. Chiggers, the larvae of certain mites, also live on humans and feed on blood. Their bite produces a wheal on the skin that is intensely itchy, the itchiness being caused by the digestive juices of the chiggers. Other bloodsucking insects that feed on humans are fleas, bedbugs, and ticks, which do not live on humans as primary hosts but in the ground, bedding, walls, and furniture; the more commonly seen lesions are those of the bedbug, which produces a burning wheal with a central punctured dot, and those of the flea, which produces a cluster of wheals and papules, resulting from the flea’s habit of sampling several adjacent spots while feeding on the skin.
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Stinging insects produce a painful swelling of the skin, the severity of the lesion varying according to the location of the sting and the identity of the insect. Many species of bees and wasps have two poison glands, one gland secreting a toxin in which formic acid is one recognized constituent, and the other secreting an alkaline neurotoxin; acting independently, each toxin is rather mild, but when they are injected together through the stinger, the combination has strong irritating properties. In a small number of cases the second occasion of a bee or wasp sting causes a severe allergic reaction known as anaphylaxis.
Hornets, some ants, centipedes, scorpions, and spiders also sting. Some insects leave their stinger in the wound. Multiple stings may give rise to severe systemic symptoms and in rare instances may even lead to death; the bites of some spiders are known to be lethal, particularly to young children.