Minoxidil application for the treatment of seborrheic alopecia is a certain effect, the efficacy has been clinically recognized. The active ingredient is minoxidil, which can stimulate the proliferation and differentiation of hair follicle epithelial cells, so that the resting hair follicles into the anagen phase, and has a diastolic effect on the peripheral blood vessels, and can promote angiogenesis, so as to increase the blood flow and nutrient supply to the lesion area, in order to maintain the normal shape of the hair follicle. Minoxidil can also be used to treat hair loss by opening potassium channels, inhibiting T-lymphocyte infiltration and reducing perifollicular inflammation. Some patients may experience increased hair loss in the course of 4-8 weeks of use, generally can continue to adhere to the use, minoxidil efficacy can be enhanced with the increase in use time. Seborrheic alopecia is a disease in which the hair follicles show progressive reduction of hair under the action of androgens, often occurring in adolescence and post-puberty, with genetic susceptibility, there is no cure. If left untreated, the patient’s hair volume will decrease at an average rate of 7% per year. The commonly used treatment options include topical minoxidil, oral finasteride and hair transplantation. Minoxidil can effectively improve hair loss, as long as the patient’s hair follicles are not necrotic, it can usually promote new hair production, because the hair follicles are non-renewable, once necrosis, can only be improved by hair transplantation.