Where acute hives last for less than six weeks, chronic hives are those that persist for more than six weeks and/or recur frequently over months or years. By definition, c… See more

Dermatographismis a form of pressure urticaria in which hives will form along the lines of trauma … See more

Hives (urticaria) are a type of rash that causes raised, red, itchy bumps or welts. Hives may be acute, appearing quickly and usually resolving quickly on their own. Or, they may b… See more