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Loxoscelism (/ l ɒ k ˈ s ɒ s ɪ l ɪ z əm /) is a condition occasionally produced by the bite of the recluse spiders (genus Loxosceles). The area becomes dusky and a shallow open sore forms as the skin around the bite dies . It is the only proven type of necrotic arachnidism in humans.
[5] [13] As each bite takes a tiny amount of blood, chronic or severe infestation may lead to anemia. [5] Scratching bites may lead to bacterial skin infection. [5] [14] Systemic poisoning may occur if the bites are numerous. [15] The bite itself may be painful thus resulting in poor sleep and worse work performance. [5]
Bites occur commonly during dressing as spiders are trapped in the sleeve or pant leg. Bites usually become painful and itchy within 2 to 8 hours, pain and other local effects worsen 12 to 36 hours after the bite with the necrosis developing over the next few days. [31] Around the face, swelling is common.
Spiders do not feed on humans and typically bites occur as a defense mechanism. [20] This can occur from unintentional contact or trapping of the spider. [20] Most spiders have fangs too small to penetrate human skin. [21] Most bites by species large enough for their bites to be noticeable will have no serious medical consequences. [22]
When ants bite humans, it grabs the skin and also sprays a compound called formic acid, Frye explains. Ant bites tend to be small, swollen bumps that appear in clusters, Kassouf says.
Not all spider bites inject venom – a dry bite, and the amount of venom injected can vary based on the type of spider and the circumstances of the encounter. The mechanical injury from a spider bite is not a serious concern for humans. Some spider bites do leave a large enough wound that infection may be a concern. However, it is generally ...
Edema (American English), also spelled oedema (British English), and also known as fluid retention, dropsy and hydropsy, is the build-up of fluid in the body's tissue, [1] a type of swelling. [4] Most commonly, the legs or arms are affected. [1] Symptoms may include skin that feels tight, the area feeling heavy, and joint stiffness. [1]
Angioedema is an area of swelling of the lower layer of skin and tissue just under the skin or mucous membranes. [1] [3] The swelling may occur in the face, tongue, larynx, abdomen, or arms and legs. [1] Often it is associated with hives, which are swelling within the upper skin. [1] [3] Onset is typically over minutes to hours. [1]