Hives and allergies are two different concepts, hives is the name of a disease and allergies are the cause of the disease. Hives are mainly caused by allergies, but not exclusively allergies, such as physical factors, mental factors and other internal diseases can cause hives. Allergy can cause hives, but also cause other skin diseases, such as atopic dermatitis, contact dermatitis, solar dermatitis, eczema, purpura, etc. are caused by allergies, so hives and allergies are two different things, not a concept.