In the cold winter, some patients may develop wind clumps, rashes, edema and intense itching on exposed parts of the body or areas in contact with cold objects when they are suddenly exposed to cold, and the rash will slowly subside once they step into a warm environment. These symptoms are typical of what we usually call cold urticaria. Although cold urticaria comes and goes quickly, it often lasts for years and does not heal repeatedly. In addition to keeping warm in the winter and treating with symptomatic medication, patients with cold urticaria can also use self-cold desensitization therapy, which is also effective. The second hospital of Harbin Medical University, Department of allergic reactions, Ma Yuemei The method is this: take a slightly larger bucket, a thermometer to measure the water temperature. Every morning and evening, the patient puts the temperature-calibrated water into the bucket and uses it to wash hands and body, and finally soaks both feet into the bucket for 10 to 15 minutes, then dries them with a towel and puts on clothes. The water temperature at the beginning should not show any uncomfortable symptoms, generally the common water temperature is 20℃, after that, if the patient tolerates well, the temperature will be lowered by 3℃ every two weeks, from 17℃, 14℃, 11℃ to 8℃ in order. General patients who can tolerate the water temperature of 8 ℃, the original state of their particular sensitivity to cold can be significantly improved.