Boys typically grow pubic hair during puberty, between the ages of about 12 and 15. As boys enter puberty, testosterone levels rise, producing a pubertal growth spurt and the onset of metamorphosis. The main manifestation of this is in the development of the external genitalia. Pubic hair grows, testosterone increases bone mineral content throughout the body, decreases body fat, and produces acne, which is one of the sensitive indicators of excess androgen. The amount and distribution of hair, especially pubic hair and whiskers, are important characteristics of androgen levels. The timing of pubic hair growth in boys is not very uniform for each individual specifically, with some people arriving at puberty earlier and others relatively later. Parents can regularly record the child’s height, weight level, if you find that growth and development significantly deviated from the normal situation, we should promptly go to the hospital pediatrics department to find the cause, do targeted treatment.