There is no obvious relationship between cosmetic allergies and flat warts on the face. Flat warts are caused by human papillomavirus infection, the virus can enter the skin tissue through direct or indirect contact or contact with the skin tiny vesicles, the formation of superfluous organisms, usually not accompanied by discomfort, there is a certain self-limiting disease. When the skin appears obvious itching, warts suddenly increase, increase in size need to consult a doctor, follow the doctor’s instructions for liquid nitrogen freezing, laser cauterization or the use of imiquimod cream and other medication. Cosmetic allergy is mainly manifested in the skin redness, itching, dryness, rash and other discomforts, stop using allergic cosmetics and gradually recover, if necessary, follow the doctor’s advice to use loratadine and other drugs anti-allergy treatment. The actual cosmetic allergy has no obvious relationship with the onset of flat warts, but if the skin has obvious itchiness, flaking, rash, it is recommended to consult a doctor in time for treatment.