Our expert says:
This sounds like a Physical form of Urticaria. Sun and ultraviolet light may be implicated (Solar Urticaria, and even Polymorphic Light Eruption). Sudden temperature changes when swimming and rapid skin cooling with the wind blowing may also be implicated (Cold Induced Urticaria). You may need to take a daily antihistamine such as Cetirizine when you go to the coast for a holiday.
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