Urushiol-induced contact dermatitis (also called
Toxicodendron dermatitis and
Rhus dermatitis) is the medical name given to
allergic rashes produced by the oil
urushiol, which is contained in various plants, including the plants of the genus
Toxicodendron (including
poison ivy,
poison oak, and
poison sumac), other plants in the sumac
Anacardiaceae family (
mango,
pistachio, Rengas tree,
Burmese lacquer tree,
India marking nut tree, and the shell of the
cashew nut), and unrelated plants such as
Ginkgo biloba. As is the case with all
contact dermatitis, urushiol-induced rashes are a
type-IV hypersensitivity reaction, also known as delayed-type hypersensitivity.