Feverdane is medically known as urticaria, which is a localized edema caused by a temporary increase in vascular permeability of the skin mucosa, mostly manifesting as a wind cluster, accompanied by varying degrees of itching, and the artificial scratch sign can be positive. The disease is mostly thought to be caused by allergies, but most patients in the clinic are not able to find the exact cause of allergies. Common causes include food, infections, medications, respiratory inhalants, and skin contacts. In addition, physical factors such as cold, heat, friction, stress, mental and genetic factors can also lead to urticaria. It is also believed that urticaria is related to the immune function of the body, and systemic diseases such as malignant tumors and endocrine disorders can also accompany urticaria.