Phytophotodermatitis from Heracleum mantegazzianum.
Five individuals developed striate bullous dermatitis two days after exposure on a clear day to Heracleum mantegazzianum, Umbelliferae (Parsnip) family. Photopatch testing confirmed phototoxicity from the plant. This and 28 other Heracleum species yield linear furanocoumarins.
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