Poison Sumac: Identification, First Aid, Natural Comfort Measures, and Safety
Poison sumac grows only in wetlands and is often more severe than poison ivy or oak -- how to identify it, tell it apart from harmless sumacs, and what real first aid looks like.
Poison sumac (Toxicodendron vernix) is less commonly encountered than poison ivy or poison oak because it grows almost exclusively in wet, swampy, boggy ground -- but its urushiol reaction is often reported as more severe. It never grows on dry upland sites like typical roadsides, fields, or sunny hillsides, which is one of the most useful facts for telling it apart from its harmless sumac look-alikes.
How to identify it, and how to rule it out
Poison sumac is a shrub or small tree, typically 6 to 25 feet tall, with compound leaves made of 7 to 13 smooth-edged (not toothed), glossy leaflets arranged in pairs plus one at the tip, on a rachis that is characteristically reddish. Its fruit hangs in loose, drooping clusters of small, whitish to gray-green berries. Two common sumacs that are completely harmless to touch -- staghorn sumac and smooth sumac -- look similar at a glance but have toothed (serrated) leaflets, fuzzy new twigs (staghorn), and upright clusters of bright red berries, and both grow on ordinary dry roadsides and fields, never in standing water. If a sumac is growing on dry upland ground, it is very unlikely to be poison sumac.
First aid
The same urushiol decontamination principle applies: wash exposed skin with lukewarm, soapy water as soon as possible, wash contaminated clothing and gear separately, and use gloves that actually block the oil (not thin latex) when handling anything that may carry it.
Comfort measures once skin is washed
Cool compresses, a colloidal oatmeal bath, and calamine lotion (kept off the face and genitals) apply the same way here as with poison ivy and poison oak, for minor itching on already-decontaminated skin.
When to get medical care
Given poison sumac's reputation for more severe reactions, treat a widespread rash, facial or genital involvement, significant blistering, or fever as reasons to see a clinician sooner rather than later, and treat difficulty breathing or swallowing as an emergency, especially after any possible smoke inhalation.