Whether or not it matters if a boy’s genitals are small should depend on the actual situation, depending on the boy’s age and how small his penis is. Generally speaking, before a boy enters puberty, his genitals have not yet developed, so his genitals are relatively small, which is a normal physiological manifestation and will not cause adverse effects. During puberty, the genitals gradually begin to develop and will become longer and thicker. If they do not develop for a long time and remain small, it may cause adverse effects and should be treated actively. Because, if the genitals do not develop during puberty, it is difficult for them to develop again after puberty, which may have adverse effects on sexual life and psychology in adulthood. The small size of the penis in adolescent boys may be related to a variety of factors such as androgen deficiency, which should be examined and treated by a doctor in a timely manner.