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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. Touching sap from the wild parsnip plant — combined with exposure to sunlight — can cause a burn-like skin reaction. Within a day after exposure, the skin turns red and might develop painful blisters. 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 moisturizer. Talk to your doctor if the reaction is painful or the blisters are severe or last longer than a couple of weeks.
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