Urticaria is an allergic disease that is caused by the dilation of small blood vessels under the mucous membrane of the skin and the exudation of the contents of the blood vessels, which clinically manifests itself as erythema or wind masses on the skin, which do not last more than 24 hours. The causes of urticaria are varied and are related to diet, drugs or pollen, internal parasites and bacteria, and sometimes to autoimmune diseases. There are foreign allergens, infectious agents or factors within the body itself, alternating hot and cold stimuli in the surrounding environment, high levels of stress and excessive pressure can also trigger urticaria. In infants, hives can be caused by undercooked eggs when the baby is first introduced to complementary foods, so the causes of hives are many and complex.