Slide show: Poison ivy and other summer skin irritants
Photo of a reaction to wild parsnip
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Wild parsnip grows in sunny areas, often along highways and in prairies. The plant bears large clusters of yellow flowers on a thick stem. Sap from the wild parsnip plant — along with exposure to sunlight — can cause a burn-like reaction on the skin. Within a day after exposure, the skin turns red and might blister. The blisters might be painful. While mild reactions might go unnoticed, a severe reaction can cause skin discoloration for months or years.

Soothe the affected area with a cool, wet cloth or an emollient. Consult your doctor if the reaction is painful or the blisters are severe or last longer than a couple of weeks.

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