This is a form of Physical Urticaria called Cholinergic Urticaria. Sudden temperature changes of the skin cause the release of histamine from Mast Cells and the reaction usually persists for less than one hour. The way forward would be to avoid any rapid temperature changes in the skin, or if a reaction is anticipated,then to take an antihistamine such as Texa 10 about 30 minutes before exposure.
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