On future outdoor adventures, steer clear of plants that have three shiny leaves coming from a central stem. If you act quickly to wash the plant's oily resin off your skin -- it becomes irreversibly bound within 15 minutes of exposure -- you can prevent or minimize a reaction.
The fix: After swimming, rinse with fresh water to remove any salt or chlorine buildup, which can further dry out and irritate skin. Keep subsequent baths and showers short (no longer than five minutes) and use a mild cleanser and warm water. Gently use a loofah, washcloth or exfoliating scrub to slough off dead cells. After bathing, towel-dry and moisturize immediately with a rich lotion. "You need to seal in the moisture while you're still slightly damp," said Bank.
More From Prevention: