The 11-year-old boy long pubic hair is the manifestation of the emergence of secondary sexual characteristics, individual development time is not fixed, is a normal phenomenon. Male long pubic hair is the development of secondary sexual characteristics during puberty, mostly between the ages of 11 to 18 years old gradually developed completely, the development time varies from person to person. Around the age of 11, began to appear in the root of the penis, pubic bone part of the short, sparse pubic hair, soft texture, light color, is the beginning of the sign of long pubic hair, to the age of 18 years of age gradually mature development. It is worth noting that if the growth of pubic hair in 11-year-old boys is more, dense, thick and long, it may be a manifestation of early development, in this case, it is recommended to go to the endocrinology department of the hospital in time, as soon as possible to clarify the diagnosis.