Allergist: Going outdoors with the resultant temperature change and/ or certain activities may release histamine or other substances that causes the itching reaction. Apparently you don't break out in a rash such as hives or angioedema. Taking a nonsedating antihistamine like claritin (loratadine) before you go out may prevent this reaction. An allergist is best qualified to evaluate and advise you.
Answered 4/6/2016
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