Facial oiliness may be caused by genetic factors, nursing factors, dietary factors, environmental factors, endocrine factors, seborrheic dermatitis and other reasons. 1. Genetic factors: oily skin has a genetic predisposition, and when parents have oily skin, their children may also have oily skin. 2. Nursing factors: daily life do not pay attention to skin moisturizing care, the skin is in a state of dehydration, will secrete more sebum to protect the skin, resulting in facial oil imbalance, facial greasy. 3. Dietary factors: daily eating greasy, too sweet, spicy food, can also lead to sebaceous gland secretion increase, and the skin greasy. 4. Environmental factors: sebaceous glands secrete too much sebum in a hot environment, leading to symptoms of facial oiliness. 5. Endocrine factors: increased secretion of androgens can lead to sebaceous gland secretion function, especially common in adolescence, often appear greasy skin, large pores and other symptoms. 6. Seborrheic dermatitis: may be related to genetic, immune, hormonal and other factors, patients often appear face and scalp oil, but also with itching, peeling, alopecia, dandruff and other symptoms. Facial oil may also be caused by other factors, or may be the result of a combination of factors, it is recommended that patients seek medical attention to clarify the cause of the disease.