Seborrheic alopecia is a sex-limited condition due to genetic and androgenic influences, which is particularly common in adult men with patches of balding hair, known as alopecia areata in foreign countries and as alopecia areata in China. The alias of this disease is male pattern baldness or androgenetic alopecia. This disease mainly occurs in the frontal and top parts of adult men, and the front edge of the hair, especially the frontal hairline, recedes symmetrically, and the pattern of hair loss can vary from person to person. The rate of hair loss varies, some hair on the top and frontal area gradually thinning over a number of years, some in a relatively short period of time, rapid hair loss and exposure of the scalp, frontal and top hair can be lost and a smooth scalp, or there are still a few white fine hair. The hair loss area has different shapes, often both sides of the temporal, occipital hair surrounded by a horseshoe shape, and in severe cases, only the occipital bone area hair at the hairline some hair. Female alopecia can also occur, but it occurs later and develops more slowly, with diffuse thinning of hair, especially on the top of the skull, and generally does not lose all, and the frontal hair edge on both sides of the temporal area receding as in men is rare. The scalp is often oily. Androgenetic alopecia often has a family history, and some believe that autosomal dominant irregular inheritance, but is affected by gender and age. The earliness and style of hair loss are genetically related. It is generally believed that the growth of frontal and top hair is controlled by androgens, and that such hair loss does not occur in those who have had their testicles removed before puberty for some reason, but can occur if testosterone is given. The androgen levels of patients with androgenetic alopecia are similar to those of normal people, who often do not lose hair even when receiving large amounts of androgenic drugs, whereas the hair follicles of patients with this disease are innately sensitive to androgens and may inhibit their metabolic process due to the accumulation of 5-alpha dihydrotestosterone in the hair follicles. The amount of testosterone contained in the urine of female patients with this disease is almost the same as that of normal males. Local conditions such as oily scalp do not affect hair growth. Although patients with androgenetic alopecia often have seborrhea, it should not be called “seborrheic alopecia”. Androgenetic alopecia often begins in youth or middle age and does not need to be called “progeria”. The results of treatment are usually disappointing. Minoxidil can be used topically to promote hair growth, but it does not stop hair loss. Bupropion is effective, but it has some side effects when stopped. Hair transplantation has been tried.