It usually affects children who have not yet developed immunity to these bites. Some people have “papular urticaria” in reaction to insect or spider bites. Hives can appear anywhere on the body, such as the: People with chronic hives can have the symptoms for months or years. In some cases, hives persists for several days. A reaction to a drug can appear at once or much later, even years after starting to use the medication. Reactions to food colorings and other additives can appear after 12–24 hours. In a person with a food allergy, hives usually appear within 1 hour. The reaction occurs 10–60 minutes after exposure to the allergen and lasts up to 24 hours. In someone with contact urticaria, the skin reacts to an allergen, such as latex or an irritant. The time it takes for the lesions to appear depends on the cause.
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