title: Immunologic contact urticaria.
abstract: The wheal and flare reaction from direct contact with a chemical or protein agent is known as contact urticaria. Contact urticaria can be either nonimmunologic (no sensitization required) or immunologic (sensitization required). Immunologic contact urticaria often gives a more aggravated response and has the potential to spread from the local vicinity. Skin testing in immunologic contact urticaria gives a quicker response compared with skin testing in nonimmunologic contact urticaria. There are a wide variety of agents that can cause immunologic contact urticaria, and they can be either low-molecular-weight chemicals (haptens) or proteins.
authors.affiliation: Department of Cutaneous Allergy, St John's Institute of Dermatology, King's College, St Thomas' Hospital, Lambeth Palace Road, London SE1 7EH, UK. Electronic address: john.mcfadden@kcl.ac.uk.
authors.forename: John
authors.initials: J
authors.lastname: McFadden
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D002648:Child; D002675:Child, Preschool; D003877:Dermatitis, Contact / Q000175:diagnosis / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D014581:Urticaria / Q000175:diagnosis* / Q000209:etiology*; D055815:Young Adult
keywords: Atopic; Contact urticaria; Cosmetics; Food