The mechanism by which plants induced urticaria is mediated by their toxins. It 's a non-immunological reaction that occurs in most indvidui coming into contact with plants such as "nettle" (the word "urticaria" comes from the Latin "nettle" ).
These plants on their leaves contain "trichomes", ie, thin needles thin hair, which contain a bulb at the base, in contact with the skin peeled off from the leaf and through the trichomes, releasing their contents into the skin, causing histamine release, and urticaria.
The reaction can take up to 12 hours.
The most common stinging nettle in the United States is the 'Urtica dioica ", while the most dangerous is the Australian" dendrocnide, which has also caused the death of an individual. There are also forms of immunological urticaria, in which the subjects have an allergy against certain
plants and may come into contact with food or inhaling their pollen.
typical case is the celery (Apium graveolens, which can cause anaphylaxis or generalized urticaria ).
In this boiling or freezing the plant reduces its allergenicity.
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