Frontal hair loss is a typical symptom of seborrheic alopecia, which generally belongs to the M-type of hair loss, a type of seborrheic alopecia determined by hereditary factors, mainly due to genetic determination. Because most of this hair loss is due to the individual’s androgen secretion is too high, especially the testosterone content is particularly high, higher than the normal value of several times, even higher than 50%, etc., which will be a large number of stimulation of hair follicles sebaceous glands, sebaceous glands will have a certain degree of hyperplasia, not only hyperplasia, but also a large number of secretion of sebum. These activities squeeze the hair follicles around the sebaceous glands, so that the hair follicles will gradually shrink, and after the hair follicles shrink, hair loss is formed.