![]() Washing may help limit additional damage. I did shower after working in the garden, but it didn't do any good. You cannot “wash off” phytophotodermatitis chemicals with soap and water once they are activated by UV radiation. If you visit the Medscape website, they go into a detailed explanation of how the chemicals in the plants that cause the damage (Furocoumarins) are activated in stages under different conditions, and how they actually damage the DNA of the skin. If you're working with wet plants on a hot summer day, it's going to be worse. This is one of the aspects that makes PPD different from most other contact dermatitis. You don't realize you're in trouble until several days after exposure, by which point, you're skunked. In other words, your skin erupts with blisters and itchy, burning red areas because you were in contact with plant chemicals (in this case, parsnip and carrot sap) and exposed to sunlight. The phototoxic result may be intensified by wet skin, sweating, and heat. The eruption usually begins approximately 24 hours after exposure and peaks at 48-72 hours. Phytophotodermatitis (PPD) is a cutaneous phototoxic inflammatory eruption resulting from contact with light-sensitizing botanical substances and long-wave ultraviolet (UV-A 320-380 nm) radiation. Medscape defines Phytophotodermatitis as: I'm Going to Stop Growing “Poison Parsnips” Because They're Too Dangerous.Which Plants Cause Phytophotodermatitis?.
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