title: Gas plant (Dictamnus albus) phytophotodermatitis simulating poison ivy.
abstract: A 48-year-old man presented with an itchy rash that resembled superficial burns or cane marks on his left forearm; similar lesions had appeared every summer for 5 years. Poison ivy dermatitis had been the initial diagnosis, but the patient knew that this plant was absent from his well tended garden. A visit to the garden revealed the gas plant Dictamnus albus, and occlusive patch testing with leaf cuttings produced a reaction after the skin was exposed to sunlight. Gas plant phytophotodermatitis was diagnosed.
mesh_terms: D002170:Canada; D003877:Dermatitis, Contact / Q000175:diagnosis* / Q000209:etiology; D011040:Dermatitis, Toxicodendron / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D010787:Photosensitivity Disorders / Q000175:diagnosis* / Q000209:etiology; D010947:Plants, Toxic