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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]
So for example if a person has an allergic contact dermatitis on the eyelids, say from use of makeup, touching the contact allergen with the fingers can trigger an allergic reaction on the eyelids. [citation needed] This is due to local skin memory T-cells, which remain in the original sensitization site.
Rhodiola is a genus of perennial plants in the family Crassulaceae [1] that resemble Sedum and other members of the family. Like sedums, Rhodiola species are often called stonecrops. Some authors merge Rhodiola into Sedum. [2] [3] Rhodiola species grow in high-altitude and other cold regions of the Northern Hemisphere. [4]
Rhodiola rosea is from 5 to 40 centimetres (2.0 to 15.7 in) tall, fleshy, and has several stems growing from a short, scaly rootstock. Flowers have 4 sepals and 4 petals, yellow to greenish yellow in color sometimes tipped with red, about 1 to 3.5 millimetres (0.039 to 0.138 in) long, and blooming in summer.
Type III hypersensitivity, in the Gell and Coombs classification of allergic reactions, occurs when there is accumulation of immune complexes (antigen-antibody complexes) that have not been adequately cleared by innate immune cells, giving rise to an inflammatory response and attraction of leukocytes.
Rhodiola crenulata is a species of flowering plant in the family Crassulaceae, native to the Himalayas. [ 1 ] [ 2 ] A geophyte usually 5 to 20 cm (2 to 8 in) tall, it is typically found at elevations from 2,800 to 5,600 m (9,200 to 18,400 ft) above sea level. [ 2 ]
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An allergic reaction can be caused by direct contact with an allergen. For example, through consuming a certain food, inhalation of pollens or dust mites, or direct contact with a certain material. A family history of allergies also leads to a higher risk of developing allergic diseases. [4]