In some people the urticaria (hives) is brought on specifically by cold conditions. Usually they don't know why people get cold urticaria . Antihistamines like Zyrtec, Claritin do not work so well . It may be possible to desensitise yourself against cold exposure by starting with a form of washing which you know does not harm you, and repeating this, slowly increasing your exposure to cold. For more information please click the link.
http://www.users.globalnet.co.uk/~aair/urticaria.htm#Cold_Urticaria
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