The summer came, the temperature gradually rose so that the cheeks and t-zone these locations of oil secretion more and more obvious. The reason for excessive oil secretion: 1, hereditary congenital sebaceous glands developed, oil secretion function is strong, this situation is mostly seen in men. 2, endocrine imbalance, mainly androgen secretion increase, resulting in sebaceous glands secrete oil increment. 3, age factor, age is the key factor that directly affects the sebum level, the sebum secretion of the sebaceous glands will decrease with age, suitable for mature skin care products are usually thick and mellow for this very reason. 4, external influence, when the summer temperature is higher will stimulate the sebaceous glands to secrete oil, while in the cold winter, the situation of shine rarely occurs.