Acetylcholine-induced whealing in cholinergic urticaria – What does it tell us?

Background null Cholinergic urticaria (CholU) is characterized by the occurrence of itchy wheals induced by sweating. Intradermal injections of acetylcholine (ACh) have been proposed to help with diagnosing CholU and subgrouping of patients, but controlled studies are largely missing. null null null Objective null To compare the rates of positive ACh test results in well characterized CholU patients and controls and to identify clinical features...