Anthony R. Brach, Ph.D.
Poison sumac is a very close relative of poison ivy, and is found throughout
the eastern U.S. but its habitat is restricted to wooded bogs so it is not
nearly as common or widespread. The active oil that causes the rash is the
same as in posion ivy, there is no cure, only symptomatic treatment once the
rash breaks out. The oil can be removed by washing with non-oil base soaps
(fels naptha is an old favorite) or with special cleaners like Technu (brand
name) but the affected skin must be washed soon after contact, usually
within an hour.
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