The main reason for the loss of pubic hair is the following: 1. due to the normal metabolism, pubic hair, like hair, will also be metabolized and will grow back after shedding. 2. due to certain diseases, such as local seborrheic dermatitis. The actual fact is that you can find a lot of people who are not only in the market, but also in the marketplace. 3, with the growth of age, the sweat pores are aging like human organs, so the metabolism slows down. The pores will also appear degraded, so the pubic hair will fall off when you tug. And with age, pubic hair will gradually decrease as well as hair.