Pore size is usually mainly due to sebaceous gland secretion, skin aging and improper cleaning care, once found need to seek medical treatment. 1. Excessive sebaceous gland secretion: sebaceous gland secretion is mainly regulated by hormones, when the body androgen level increases or the activity of the sebum secretion will increase, the accumulation of material will easily cause pore clogging, which will lead to the pores are getting bigger and bigger. 2. Skin aging: because the skin will gradually aging along with the age increase, especially the gradual loss of collagen will lead to its support for the hair follicles continue to weaken, at this time the skin becomes more and more flaccid, and even hair follicle collapse, pores gradually become larger. 3. Improper cleaning and care: If the cleaning is not in place, especially after makeup, it will lead to cosmetics, dust and other residues on the skin surface, easy to clog pores, causing large pores. There may be other reasons for enlarged pores, it is recommended to go to the hospital, clarify the cause and treat the symptoms.