It is not always obvious which plant is responsible for a flare-up of dermatitis . The rash may take various forms.
Big blisters appear on exposed parts which have been in contact with the plant.
Anyone can get this kind of plant dermatitis, which settles leaving brown marks which may last several months. Other plants cause a rash only in certain people who have developed an allergy to them. Primula obconica and chrysanthemum can also cause allergic rashes. Not everyone is allergic to these plants, but those who are may even get rashes from pollen carried in the wind. Plant dermatitis is not contagious and the blister fluid does not spread the rash.