The causes of increased blackheads are mainly related to high androgens, bad habits, skin dehydration and the wrong use of skin care products and cosmetics. 1, high androgens: high androgens in patients can cause excessive secretion of facial sebum, and if patients do not pay attention to further cleaning, it can lead to the accumulation of oil in the pores, and then the surface oxidation to form more blackheads; 2, bad habits: if patients do not sleep enough, eat too much spicy and high sugar diet, can lead to sebum secretion in the sebaceous glands, which makes more follicle mouth formation of keratinized keratosis, that is, blackheads, bad habits do not improve, blackheads will be more and more; 3, skin dehydration: when the patient’s skin water content is reduced, the tissue cells around the hair follicle dry, can make the follicle mouth expansion, resulting in an increase in the area of facial redox reaction, which in turn leads to a gradual increase in blackheads; 4 Wrong use of skin care products, cosmetics: If patients use tearing products such as nose patches to suck out blackheads, while not paying attention to shrink pores, can lead to an increase in pores, which in turn causes an increase in blackheads. In addition, if patients use BB cream, foundation and other powder cosmetics for a long time, it may block the pores, resulting in oil can not be secreted, resulting in more and more blackheads.