There are many causes of excessive oil on the scalp and face, most commonly related to genetic factors, endocrine factors, vitamin deficiency factors, and dietary factors. Genetic factors are inherited from parents, and some people who have a high sebaceous gland secretion and a large number of sebaceous glands may have oily skin and have more oil on their face and scalp. Endocrine factors such as high androgens can cause the sebaceous glands to secrete a lot, leading to excessive oil on the scalp and face, acne, and even hair loss, among other clinical manifestations. Vitamin deficiency may lead to excessive oil on the scalp and face. In terms of life and diet, staying up late, watching cell phones and computers for a long time, mental tension, and eating too much sweet, spicy, greasy, and strong tea and coffee will also lead to scalp and facial oil.