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Urushiol-induced contact dermatitis (also called Toxicodendron dermatitis or Rhus dermatitis) is a type of allergic contact dermatitis caused by the oil urushiol found in various plants, most notably sumac family species of the genus Toxicodendron: poison ivy, poison oak, poison sumac, and the Chinese lacquer tree. [1]
Urushiol / ʊ ˈ r uː ʃ i. ɒ l / is an oily mixture of organic compounds with allergenic properties found in plants of the family Anacardiaceae, especially Toxicodendron spp. (e.g., poison oak, Chinese lacquer tree, poison ivy, poison sumac), Comocladia spp. (maidenplums), Metopium spp.
Additionally, plants that cause contact allergies (such as rashes or itching), or that are highly poisonous when ingested even though their pollen does not cause respiratory allergies, are never given low ratings. [1] Low allergy ratings are considered to be 1 through 3 on the allergy scale.
It contains trees, shrubs and woody vines, including poison ivy, poison oak, and the lacquer tree. All members of the genus produce the skin-irritating oil urushiol , which can cause a severe allergic reaction.
The bite from an oak leaf itch mite can cause an itchy rash and redness of the skin with small, raised, pimple-like bumps, Penn State Extension says. Although they normally feed on insects, they ...
Toxicodendron diversilobum is extremely variable in growth habit and leaf appearance. It grows as a dense 0.5–4 metres (1 + 1 ⁄ 2 –13 feet) tall shrub in open sunlight, a treelike vine 3–9 m (10–30 ft) and may be more than 30 m (100 ft) long with an 8–20 centimetres (3 + 1 ⁄ 4 – 7 + 3 ⁄ 4 inches) trunk, as dense thickets in shaded areas, or any form in between.
This is called oral allergy syndrome. Some people who react in this way to fruit or vegetables will also react to pollen from some trees and weeds. So, for example, people who are allergic to birch pollen are also likely to be allergic to apples. Another symptom may include slight swelling in the throat, making it feel like it is closing.
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