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 common cause of allergic contact dermatitis in the United States, black-spot poison ivy dermatitis is relatively rare.
Dermatitis. 2008;19(1):48-51. © 2008 American Contact Dermatitis Society
Cite this: Black-Spot Poison Ivy - Medscape - Feb 01, 2008.