Currently, it is believed that the head and the face are the same densely distributed sebaceous glands. For adolescent men and women, due to the excessive secretion of androgens in the body, androgens are most likely to stimulate the sebaceous glands and increase the secretion of cortical oil at this time. In addition, if there are certain mental factors, such as excessive emotional stress, anxiety, depression, etc. will also stimulate the sebaceous glands to secrete sebum. In addition, some people eat greasy food, some people do not control the light diet, eat too much spicy, acidic, stimulating food, and even some people eat seafood food, such as fish, shrimp and other hair products can stimulate the scalp oil. So for the scalp oil should be aimed at its stimulating factors to prevent the occurrence of seborrhea or folliculitis induced by excessive scalp oil.