title: [Chronic contact urticarias].
abstract: In most cases, contact urticaria is acute and is diagnosed straightforward; indeed it appears immediately after the application of the urticariogen(s) and disappears promptly after removal of the contact. On some rare occasions, contact urticaria is chronic for two main reasons: sometimes, it is provoked by an unknown urticariogen; in other cases, it is one of the clinical signs of protein contact dermatitis. In both situations, diagnostic procedures to be applied are of prime importance; treatment is submitted to the elimination of the responsible urticariogen. Acute and chronic varieties of contact urticaria can be subdivided into two categories: immunological and non-immunological. Diagnostic procedures include prick testing and/or patch testing (with immediate reading).
authors.affiliation: Service de Dermatologie, Université Catholique de Louvain, Clos Chapelle-aux-Champs 30, UCL 3033, B-1200 Bruxelles, Belgique.
authors.forename: D
authors.initials: D
authors.lastname: Tennstedt
mesh_terms: D000485:Allergens / Q000009:adverse effects; D000818:Animals; D002908:Chronic Disease; D017449:Dermatitis, Allergic Contact / Q000175:diagnosis / Q000276:immunology / Q000503:physiopathology; D003877:Dermatitis, Contact / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D003875:Drug Eruptions / Q000209:etiology; D006801:Humans; D012882:Skin Tests; D014581:Urticaria / Q000175:diagnosis / Q000209:etiology* / Q000276:immunology / Q000503:physiopathology; D015262:Xenobiotics / Q000009:adverse effects
chemical_list: D000485:Allergens; D015262:Xenobiotics