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Urticaria 

Devil's Leaf; Devil?s Leaf; Nettle Tops; Stinging Nettle; Urtica dioica; Urtica species; Urtica urens 

Urticaria or hives is a relatively common form of allergic reaction that causes raised red skin welts that range upwards from 5 mm (about a 1/4 inch) in diameter, itch severely, and often have a pale border. Urticaria is caused by direct contact with an allergenic substance (generally a plant, such as poison ivy), or an immune response to food or some other allergen. Hives can also be caused by stress.

Nettle (Urtica) is a genus of flowering plants in the family Urticaceae, mostly perennial herbs but some are annual and a few are shrubby. The most prominent member of the genus is the Stinging nettle Urtica dioica, native to Europe, Asia, and North America. The genus also contains a number of other species with similar properties, listed below. ...


Hives as related to Nettle