The main causes of facial oil are the following: 1, the skin has its own regulatory function, when the skin is too dry and lack of moisture, in order to keep the skin moist itself will secrete a lot of oil, so the skin is in a balanced state, so the face will be very oily to pay attention to the skin hydration, each time after washing the face with hydration cream to rub the face, every night apply a hydration mask, adhere to a period of oily symptoms 2, due to the sebaceous glands of the face overactive secretion of large amounts of oil, so that the skin becomes greasy, choose oil-controlling cleanser wash face, diet attention to greasy, sweet, spicy, etc., the skin has stimulated the secretion of oil food do not eat, keep enough sleep do not stay up late. 3, stimulated by the external environment, such as in the hot summer, high temperature will stimulate the skin secretion of large amounts of oil, try to stay in the Cool room and drink the right amount of water, can make this situation can be improved.