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Hives are a skin reaction that causes red or white itchy welts. The welts vary in size and appear and fade repeatedly as the reaction runs its course. Chronic hives are a condition in which the welts last more than six weeks or recur over months or years. Chronic hives usually aren’t life-threatening. But the condition can be very uncomfortable and interfere with sleep and daily activities.

Click here for more information: http://www.mayoclinic.org/diseases-conditions/chronic-hives/basics/definition/con-20031634

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