Urticaria is an allergic skin disease with more allergic causes, such as dietary habits, living environment, genetic factors, autoimmune problems, etc. The causes of allergy are more complex for urticaria occurring in children. There are several common clinical causes: 1. Part of it is due to dietary habits or living environment factors. Part of the allergies often encountered in clinical practice is the long-term consumption of children such as milk, puffed food, nutritional supplements, partial diet, long-term allergies caused by such poor dietary habits. 2, part of it is caused by the living environment factors. For example, indoor renovation, allergies caused by pollution factors of decoration materials, and indoor pollen allergy or indoor bedding material allergy. 3. Part of the allergy is caused by the inflammatory reaction of the child’s body caused by infection. For example, repeated episodes of enteritis, unexplained fever, elevated blood levels, etc., can also lead to the occurrence of hives. For symptomatic episodes, loratadine granules can be used orally to control the symptoms. Then just follow the etiology and rule it out.