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A member asked:
I brake out in hives in hot temperatures, why?
A doctor has provided 1 answer
Physical urticaria: Are a set of conditions where mast cells release histamine & other biochemical mediators in response to physical stimuli rather than illness or allergy. Cholinergic urticaria is the name for hives triggered when the skin or the body get hot. Sweating, exercise, fever, hot showers may trigger hives. Other physical urticaria triggers include cold, pressure, vibration, even sunlight.
Answered 12/9/2013
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