The reason why pubic hair falls out is mainly due to the following clinical reasons: the first reason is that the local hair follicles of the pubic hair are aging, and metabolism makes the pubic hair fall out and grow new pubic hair again. This is a normal metabolic phenomenon that happens to everyone clinically. However, the amount of pubic hair shed is often small, but a small amount of pubic hair may be shed every time you wash. The second reason is clinically due to a disease, if it is due to dermatitis, such as the common seborrheic dermatitis, it will lead to more localized shedding of pubic hair. Often there are also red papules and white peeling on top of the papules, causing severe local itching of the vulva. It is recommended to actively treat the dermatitis, and the phenomenon of hair loss will be reduced.