The causes of facial allergy always appear, including the following: 1. Breakdown of the barrier function, as patients often do facial rubbing or grinding keratin, resulting in thinning of the skin stratum corneum, weakening of the barrier function and causing secondary infection of parasitic bacteria, such as Staphylococcus aureus, Streptococcus hemolyticus, resulting in a local state of immune disorder leading to allergy. 2. Long-term exposure to ultraviolet radiation of sunlight, or excessive consumption of Allergic reactions caused by beef and mutton, seafood, mangoes, durian, pine nuts, hazelnuts, etc. 3. Allergies caused by the application of poor quality cosmetics or emollients.