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More information on Hives or Urticaria
Hives or Urticaria - also called urticaria a hypersensitive skin reaction characterized by the sudden appearance of very itchy , slightly raised , smooth , flat- topped wheals and plaques that are usually redder or paler than the surrounding skin .
In the acute form , the skin lesions generally subside in 6 to 24 hours , but they may come and go and persist much longer in the chronic form .
Several specific causes of hives , as well as variant forms of its typical skin lesions , are denoted by qualifying the term urticaria with a descriptive word .
Examples include urticaria bullosa , a rare type of allergic reaction characterized by the appearance of bullae or vesicles ( large or small blisters ); solar urticaria , produced by exposure to sunlight ; and urticaria subcutanea , caused by swelling of the tissues underlying the skin .
Allergy to a specific food is probably the most frequent cause of acute urticaria ; fish , eggs , berries , and nuts head the list of common offenders .
Hives may also be triggered by drugs , especially penicillin , by biologicals containing proteins , and by inhalants ( e .
Emotional and mental stresses are believed to be major and contributing causes of chronic urticaria .
The mechanism by which psychogenic factors give rise to chronic urticaria is not clear , but the overall sequence of biological events that triggers acute urticaria has been clarified .
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