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Chronic urticaria and/or angioedema are hives or swelling that lasts more than 6 weeks. The cause is usually harder to find than in acute cases. The causes can be similar to those of acute urticaria but can also include your immune system, chronic infections, hormonal disorders, and tumors.
Hives are common. They typically last for a few hours to a few days, but it's possible to have them for months at a time. They aren't contagious, but they may spread on the skin. They may disappear from one area of your child's skin only to crop up elsewhere.