If not washed away, the resin may be easily and unwittingly transferred to other body locations, including the trunk, genital area, and face, where it will incite the same reaction. Poison ivy rash is typically seen on the extremities at sites of contact with the plant and appears as erythematous, linear plaques with associated vesicles and bullae.
A second exposure may cause a blistering skin rash to develop within 2 to 3 days after exposure to the urushiol oil. If you are predisposed to developing a rash from poison ivy, the rash usually appears between 10 and 14 days after your first exposure to the plant. Some people are genetically programmed not to develop a rash from poison ivy. Within minutes of contact with urushiol, the skin starts to absorb it. You find this oil in all parts of the plants - the leaves, stems, fruits and even the roots. Urushiol is the oil in poison ivy, oak, and sumac. The very first time an individual is exposed to poison ivy urushiol oily sap, they may or may not develop a rash. Poison ivy, poison oak, and poison sumac dermatitis is a contact dermatitis (type IV delayed hypersensitivity immune reaction) to an oily resin (urushiol) found on the leaves and in the stems and roots of plants of the Rhus genus (poison ivy, oak, and sumac). Many people get a rash from poison ivy, poison oak, and poison sumac. Outsmarting Poison Ivy and Its Cousins.Exposure to the resin of poison ivy leaves, stems, branches, and roots causes an allergic reaction in some people. Clinical Dermatology: A Color Guide to Diagnosis and Therapy. Treatment of severe poison ivy: a randomized, controlled trial of long versus short course oral prednisone. Diagnosis and management of contact dermatitis. Outsmarting Poison Ivy and Other Poisonous Plants. Patient education: Poison ivy (Beyond the Basics).
Poison Ivy, Oak, and Sumac: Who gets a rash and is it contagious?
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