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9. Rashes Appear in Response to a Trigger

Hives sometimes develop in response to a physical trigger, such as a temperature change, pressure, water, exercise, sunlight, or vibration.

Rashes from physical urticaria tend to vanish more quickly. People with cold urticaria may have a rare underlying condition that can also trigger symptoms like hypotension in response to cold water.

Young woman relaxing in the sun in Berlin city. Guido Mieth/ Getty Images

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