Induced contact Dermatitis or urushiol(called as Toxicodendron dermatitis or RUS dermatitis) is a severe type of inflammation of the allergic contact caused by oil urushiol found in various types of plants, in particular, the toxic species of genocycodicondron: Poison ivy, poison oak, poison sumac, and sugar lacquer tree. This name is derived from the Japanese word for the lacquer tree, Urushi. Other plants of the Sumac family (Mango, Pistachio, Burmese lacquer tree, Indian walnut tree, and cashew shell) also include urushiol, such as unrelated plants like Ginkgo Biloba.
As all contact occurs with dermatitis, urushiol-induced allergic rashes are a type IV hypersensitivity reaction, which is also known as delayed-type hypersensitivity. Symptoms include itching, swelling, embarrassment, and burning in severe cases.
The American Academy of Dermatology estimates that there are 50 million Eurasal-induced dermatitis cases annually in the United States, accounting for 10% of all lost injuries in the United States Forest Service. Poison oak is an important problem in rural western and the southern United States, while poison ivy is the most prevalent in the eastern United States. Dermatitis inflammation with poisoned suma is less common.