Small black hairs in the pores of the face may be caused by cui-ui hairs, exuberant androgen levels, polycystic ovary syndrome and other factors. 1. Cui hair: some small black hairs appear in the pores of the face, may be cui hair. Under normal circumstances, women’s cui hair is not very obvious. If often in the external environment, the oil secreted from the pores, coupled with external substances, adhering to the hair, may lead to black hair. 2. Endocrine disorders: into puberty, the body’s hormone levels change, such as androgen levels of secretion of exuberant, stimulate hair growth, hair may be more obvious. There are certain diseases such as polycystic ovary syndrome patients, androgen elevated, facial hair may look more, more black. In addition to this, long-term use of androgen-containing drugs, resulting in increased secretion of androgens in the body, can also lead to darker body hair. Frequent exposure to ultraviolet radiation, subcutaneous melanin precipitation, body hair darker more obvious. Often work overtime and stay up late, the use of hormone-containing cosmetics, may lead to hair blackening. It is recommended to go to the hospital for relevant examinations to find out whether the darkening of hair is related to abnormal hormone levels, polycystic ovary syndrome and other factors, and it is recommended that treatment be given to address the cause of the disease.