Seborrheic alopecia, also known as androgenetic alopecia, is the most common type of male pattern baldness and can also occur in women with a high degree of genetic predisposition. It is characterized by chronic progressive hair loss that mainly affects the hair in the center of the head. Androgenetic alopecia affects all human populations and the prevalence increases progressively with age. Studies have found significantly increased concentrations of dihydrotestosterone, 5α reductase and androgen receptors in areas of baldness on the scalp. Dihydrotestosterone causes progressive shrinkage of hair follicles and eventually leads to the transformation of terminal hair follicles into fine hairs, resulting in clinical baldness. The common pattern of hair loss is diffuse alopecia in the frontotemporal region and on top of the head. It usually starts with a bilateral reduction of hair on the forehead and becomes thin and soft, slowly extending toward the crown, with the frontal hairline receding backwards and the hair on the crown gradually starting to decrease. As the condition progresses, the hair on the forehead falls out and the hair takes an M shape. Eventually the balding area of the frontal area and the crown of the head may fuse, with only a small amount of hair remaining on both sides of the temporal and occipital areas. The skin of the hair loss area is smooth, with only a small amount of fine hair. There are no conscious symptoms in the process of hair loss, but the pattern of hair loss in women is different from that in men, with a reduction of hair on the top of the head and a receding hairline on the forehead, which may be caused by endocrine disorders. The above symptoms should be seen in the dermatology department for regular treatment, do not use random medication to cause secondary damage, thus delaying the condition.