11-year-old boys nipple if there is a hard lump, to exclude whether it is due to trauma after the local hematoma, if it is caused by trauma can be gradually absorbed, do not need to deal with. If after doing ultrasound, it is clear that the hard lump in the nipple is long breast nucleus, there are two reasons: 1, due to the 11-year-old boy obesity, the body estrogen level rises caused, at this time according to the degree of obesity and the current size of the breast nucleus, combined with the estrogen level, to give the guidance of life, diet, exercise and other aspects. It is recommended to reduce body weight, reduce estrogen levels, if the breast nucleus can disappear, then there is no need to intervene. 2, do not rule out the tumor factor, because boys should not normally grow breasts, if the boy grows breasts, the family has a genetic history of tumors, if necessary, need to be removed to do a pathological examination, to exclude the tumor factor.