Photo of cold testing with TempTest 4.0 in a patient with cold urticaria
Photo of cold testing with TempTest 4.0 in a patient with cold urticaria
This photograph shows the forearm of a patient with cold urticaria after the application of the TempTest 4.0 testing device. This device contains a U-shaped metallic element that generates differential temperatures (from 4 to 44°C). In this patient, whealing is triggered by temperatures of 24°C and lower.