Oil on the face is generally known as seborrhea. The common causes are mainly the following: I. Genetic factors, some patients have a family history, especially more male patients. Second, androgen secretion, androgen secretion after puberty, resulting in increased sebaceous gland activity and increased secretion. Third, B vitamin deficiency, some patients take oral vitamin B complex, sebum secretion will be reduced. Therefore, the increased sebum secretion may be related to the lack of B vitamins. Fourth, caused by diseases, such as hyperthyroidism, Parkinson’s syndrome, etc. Fifth, other causes, such as spicy diet, fried and deep-fried food, and frequent late night, etc.