Identification of Subpopulations of Patients With Cholinergic Urticaria Based on Infrared Exposure Test Results.

"Patients will undergo a standardized infrared exposure test (this test is specifically for research purposes) to evaluate the occurrence of cholinergic urticaria reaction.~IR exposure test with non-invasive core body temperature measurements, evaluate the occurrence of cholinergic urticaria up to 10 minutes after the end of the test, stop the test at the first clinical signs of urticaria.~Desk lamp with infrared bulb, switched on 20cm vertically from the forearm posteriorly for 3 minutes. Reading up to 10 minutes after end of exposure test: diagnosis of cholinergic urticaria flare-up if presence of pruritic micropapules on erythematous background of trunk +/- limbs. Stop the test as soon as urticarial lesions appear."