Urticaria or hives is a relatively common form of allergic reaction that causes raised red skin welts.
Urticaria is also known as nettle rash or uredo.
These welts can be 5 mm (0.2 inches) in diameter or more, itch severely, and often have a pale border.
Urticaria is generally caused by direct contact with an allergenic substance, or an immune response to food or some other allergen.
Hives can be caused by stress.
For more information about the topic Urticaria, read the full article at Wikipedia.org, or see the following related articles:
Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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