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urticaria		A vascular reaction of the skin characterized by erythema and wheal formation due to localized increase of vascular permeability.The causative mechanism may be allergy, infection, or stress. [ Articles | Books | Images | Discussion groups ]
Additional comments : Chronic urticaria is a skin disorder characterized by recurrent, transitory, itchy wheals, which occur daily or almost daily for at least three months. C Di Campli, A Gasbarrini, E Nucera, F Franceschi,- Dig Dis Sci, 1998 Chronic urticaria is currently defined as recurrent (almost daily) attacks of hives, accompanied by angioedema in 40 to 50% cases, of 6 or more weeks duration. D Zauli, A Grassi, G Ballardini, S Contestabile, S - Am J Clin Dermatol, 2002 Solar urticaria is a rare disorder in which immediate urticarial weals are induced by ultraviolet (UV) or visible irradiation. A HARRIS, SM BURGE, SA GEORGE - British Journal of Dermatology, 1997 Chronic ordinary urticaria is called 'idiopathic' if no physical, allergic, infectious, drug-related or vasculitic cause can be identified. CEH Grattan, BF O'Donnell, DM Francis, N Niimi, RJ … - British Journal of Dermatology, 2000

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