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Poison Ivy *
This photograph shows an individualís arm with a blistering poison ivy rash. The Rhus genus of plants include poison ivy, poison oak and poison sumac. When the oil from such plants gets on the skin, it begins to penetrate in minutes. A blistering reaction appears, usually within 12 - 48 hours.
Plants, Toxic, Skin
Picture & text from CDC/PHIL. For more information see Hardin MD : Medical Pictures from CDC