Cold urticaria (ur-tih-KAR-e-uh) is a skin reaction to cold that appears within minutes after cold exposure. Affected skin develops reddish, itchy welts (hives). People with cold urticaria experience widely different symptoms. Some have minor reactions to the cold, while others have severe reactions.
Contact urticaria is an immediate but transient localised swelling and redness that occurs on the skin after direct contact with an offending substance. Contact urticaria should be distinguished from allergic contact dermatitis where a dermatitis reaction develops hours to days after contact with the offending agent.