Hives / Utricaria | |
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Acute Urticaria - When the rash from the hives lasts less than six weeks. In this type of urticaria the offending allergen is identified. The allergy-causing agent is one of the many triggering factors that are usually associated with hives. Chronic Urticaria - When the rashes persists for more than six weeks the condition is chronic. In 80% of chronic urticaria the causative allergen is unknown (idiopathic urticaria). Here the hives may be caused by an autoimmune reaction. |
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colorings and antioxidants can cause allergies.