In the clinic, we see many female patients come to the clinic due to facial skin allergy. Patients always want the doctor to find out the allergen for them, while our traditional patch test is done on the patient’s back, often the result is negative, and patients often complain that they only have facial allergy, but not other parts of the body. So why is it just the facial skin that is sensitive? Sensitivity is a state and allergy is a symptom. Sensitivity refers to the fragile skin that is easily affected by various stimuli; allergy refers to a phenomenon of redness, swelling, heat, pain and itching that occurs when the skin is stimulated by various allergens. The causes of skin sensitivity are not only congenital genetic quality, but also acquired mainly with improper maintenance, abuse of cosmetics, sun exposure, wind and sand, peeling and other factors, so the facial skin becomes the weakest part. Sensitive skin is thin, fragile, capillary expansion is revealed, easily red, and uneven flushing, sometimes itchy and small rashes appear. If sensitive skin is not taken care of enough, it often shows symptoms such as redness, heat, itchiness or after a long period of topical use of hormonal topicals, the skin turns into allergy-prone skin. For sensitive skin it is recommended to avoid thermal stimulation, UV rays, excessive friction, etc. Since there is no strict regulation of beauty salon products in some places, it is recommended that girls with sensitive skin buy medical skin care products through regular channels and reduce the use of color cosmetics and other products to avoid the occurrence of hidden hormonal dermatitis. Also don’t just go to the drugstore and buy ominous ointments with ominous ingredients to apply.