Due to historical reasons, our predecessors translated the English name allergy as allergic reaction, which will be gradually changed to allergic reaction in the future, otherwise lay people often cannot understand it. Our hospital’s skin allergy department mainly treats eczema, contact dermatitis, cosmetic dermatitis, acute and chronic urticaria, atopic dermatitis, vasculitis and so on. Since they are related to the allergic reactions of the body caused by external stimuli, they are collectively called skin allergic reactions.