Poison Ivy Reaction. Poison ivy rash is a type of allergic contact dermatitis caused by an oily resin called urushiol. Poison ivy, poison oak, and poison sumac are plants that contain an irritating, oily sap called urushiol.
Poison ivy, poison oak, and poison sumac may be different plants, but they all contain the same poison: urushiol. Poison ivy rash is a type of allergic contact dermatitis caused by an oily resin called urushiol. Most people have an allergic reaction in the form of a rash when they're exposed.
And remember, a reaction to poison ivy isn't something you'll grow out of. "Once allergic, always allergic," Dr.
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Poison ivy, poison oak, and poison sumac may be different plants, but they all contain the same poison: urushiol. The allergic reaction caused by poison ivy is known as contact dermatitis. A urushiol is the basic cause of an allergic reaction especially when it comes into contact with the skin.