| http://www.w3.org/ns/prov#value | - Patients in whom no explanation for the urticaria is established are said to have chronic idiopathic urticaria; however, findings suggest that in 25-45% of patients, chronic idiopathic urticaria is not actually idiopathic but is an autoimmune disease termed chronic autoimmune urticaria.[1] An important entity in the differential diagnosis of chronic urticaria is urticarial vasculitis.
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