Your daughter's condition is quite common. First of all, don't be afraid
At present, her diagnosis should be breast fibroadenoma, or more precisely adolescent breast fibroadenoma, which is related to the rapid increase of estrogen. Her lump is not big enough, so she doesn't need surgery for the time being.
Breast fibroadenoma in adolescence is slightly different from that in adults, which grows faster and needs close monitoring. It is recommended to have an ultrasound examination in February-March. If the lump gets bigger and bigger, it needs to be surgically removed.
(Dr. Wang Ting solemnly reminds me that because I can't see the patient face to face, I can't fully understand the condition. The above suggestions are for reference only. Please go to the hospital for specific diagnosis and treatment under the guidance of a doctor! )
Xijing Hospital Wang Ting/