Learn how to identify poison ivy, oak, and sumac plants and the rashes they cause. Medically reviewed by Wendy L. Hunter, M.D. Your child was playing outside (yes!) but then an hour later ...

Poison ivy (Toxicodendron radicans) is a vine that contains an oily resin known as urushiol. According to the Centers for ...

Dermatitis. 2008;19(1):48-51. This report describes a severe case of black-spot poison ivy dermatitis, a relatively rare presentation of poison ivy dermatitis, occurring on three occasions in the ...

Like poison ivy and poison sumac, poison oak releases an oil called urushiol when it sustains damage. Your skin absorbs this allergen when you touch the plant. You may be able to reduce symptoms ...

In black-spot poison ivy dermatitis, a black lacquerlike substance forms on the skin when poison ivy resin is exposed to air. Although the Toxicodendron group of plants is estimated to be the most ...