Poison Oak is part of the Sumac (Anacardiaceae)family, Toxicodendron diversilobum or Rhus diversiloba is the binomial name for Poison Oak in the Western United States and south to Mexico.
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The original Fels-Naptha, developed by Philadelphia manufacturer Joseph Fels around 1893, was used as a home remedy in the treatment of contact dermatitis caused by exposure to poison ivy, poison oak, and other oil-based organic skin-irritants.
Sleep deprivation is common, as is routine exposure to dust, smoke, poison oak, extreme weather (both heat and cold), and other environmental hazards.
In 1894 he developed the Fels-Naptha soap brand, historically used as a home remedy in the treatment of contact dermatitis caused by exposure to poison ivy, poison oak, and other oil-transmitted organic skin-irritants.
Among the shrub species that characterize this community, prominent in the Verdugos are laurel sumac (Malosma laurina), toyon (Heteromeles arbutifolia), poison oak (Toxicodendron diversilobum), chamise (Adenostoma fasciculatum) and two species of California-lilac (Ceanothus crassifolius and C. oliganthus).
Pacific poison oak skin contact first causes itching; then evolves into dermatitus with inflammation, colorless bumps, severe itching, and blistering.