Milk nodules on the breasts of an eight-year-old girl may be caused by development or by other reasons such as trauma. Adolescent breast development usually occurs around the age of 9-13 years, but due to the individual’s physical, dietary, and environmental factors are different, so the time of breast development may vary, it is recommended that parents should observe the patient to see if there are any other adverse reactions, and if there is any discomfort, they should also go to the hospital in a timely manner for a breast ultrasound, growth hormone levels and other tests. The 8-year-old patient’s breast nodule may also be caused by trauma, if the chest is traumatized, there may be lumps and bleeding symptoms. It is recommended to go to the regular hospital in time, except for pathological factors, the patient should choose comfortable, pure cotton, the right size underwear during puberty, so as not to affect the development of breasts.