The face acne will be manifested as follicular red papules or pustules on the face, face acne is usually associated with sebum secretion, pathogenic microbial infection, skin damage and other factors, and acne after self-squeezed acne, drug stimulation, ultraviolet radiation and other factors can trigger pigmentation, appear skin color dull. A, face acne: 1, sebum secretion: If there is an endocrine disorder of the body, resulting in increased levels of sex hormones, adrenocorticotropic hormones and other hormones, will make the sebaceous glands secretion, lipids blocking pores, can lead to face acne; 2, pathogenic microbial infection: If Staphylococcus epidermidis, Malassezia, Acinetobacter and other pathogenic microorganisms invade the facial skin, the molecular peptides secreted by bacteria can differentiate Neutrophils, neutrophils produce hydrolytic enzymes to damage and rupture hair follicles, the contents of the follicle will spill into the dermis, thus triggering inflammation of varying degrees around the follicle, and eventually acne on the face; 3, skin damage: often excessive cleaning, the use of soap-based cleansers, repeated exfoliation, etc., easy to make the skin barrier is damaged, so that the water-oil balance of the skin is damaged, excessive oil secretion will block the pores, thus triggering face acne. The first thing you need to do is to take a look at the website. Promote pigment cells to generate melanin, triggering skin dullness; 3. UV radiation: UV radiation can also lead to skin dullness, especially medium-wave UV, which will promote melanocyte migration and melanin vesicle formation, making skin color darker and skin dullness. Acne and dull skin should be treated with oral and topical medications, while drugs that promote pigmentation, such as vitamin C, can be used intermittently. In addition to using medications, you should also get enough rest, avoid staying up late, and apply sunscreen when you go out to avoid the appearance of dull skin.