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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

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BRIEF: What could cause this condition?

I live in Oregon. Does any poisonous plants by the coast make a persons skin turn purplish, blistered, red and yet not itch? What about in the forest areas near the coast? My brother has something on his lower legs.


A heavy dose of poison oak can stain skin blackish or purple, but it sounds like something else. I would get him to a clinic in a hurry. I am not a doctor, but those symptoms could be indicative of some serious condition unrelated to plants.