<unk>  (also called Toxicodendron<unk>  or Rhus<unk>  is a type of allergic contact<unk>  caused by the oil<unk>  found in various plants, most notably species of the genus Toxicodendron: poison ivy, poison oak, poison sumac, and the Chinese lacquer tree. The name is derived from the Japanese word for the sap of the Chinese lacquer tree, urushi. Other plants in the sumac family (including mango, pistachio, the Burmese lacquer tree, the India marking nut tree, and the shell of the cashew) also contain<unk> , as do unrelated plants such as Ginkgo biloba. As is the case with all contact<unk> ,<unk><unk>  allergic rashes are a Type IV hypersensitivity reaction, also known as delayed-type hypersensitivity. Symptoms include itching, inflammation, oozing, and, in severe cases, a burning sensation. The American Academy of Dermatology estimates that there are up to 50 million cases of<unk><unk><unk>  annually in the United States alone, accounting for 10% of all lost-time injuries in the United States Forest Service. Poison oak is a significant problem in the rural Western and Southern United States, while poison ivy is most rampant in the Eastern United States.<unk>  from poison sumac is less common.
Urushiol-induced contact dermatitis
Phototoxic tar dermatitis
Allergic contact dermatitis
Blister beetle dermatitis
Autosensitization dermatitis
Rodent mite dermatitis
Contact dermatitis
Irritant contact dermatitis