swelling and/or tightness in the throat.difficulty with breathing and/or noisy breathing.Sometimes children have a more serious allergic reaction known as anaphylaxis. Symptoms of anaphylaxis include: Hives can look or feel unpleasant, but usually they are harmless. When there is no identifiable cause (idiopathic urticaria), hives will usually go away within a few days, but may last weeks. Depending on the trigger, hives usually settle over hours.The area of affected skin can vary in size from quite small to as large as a dinner plate. Often the wheals join together to form larger swellings.New batches may develop as old areas fade away. The wheals appear in batches or clusters.A single wheal often lasts several hours before fading without trace.
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