Heat urticaria

Heat urticaria presents within five minutes after the skin has been exposed to heat above 43 degrees Celsius (109.4 degrees Fahrenheit), with the exposed area becoming burned, stinging, and turning red, swollen, and indurated.:155 Heat urticaria presents within five minutes after the skin has been exposed to heat above 43 degrees Celsius (109.4 degrees Fahrenheit), with the exposed area becoming burned, stinging, and turning red, swollen, and indurated.:155