<s>[INST] my daughter is 13years going 14yrs in 3 months time. She has these hard lumps in her right breast which we discovered last month. they subsided a little when her periods went but now they are back huge and and she has sore lumps in her armpits as well. What could these be. I am worried, will take her to see the doctor but I would appreciate some insight to calm my nerves [/INST] Welcome to Chat Doctor .1. It looks like cyclical changes in the breast tissue.2. Disappering of the lumps means its just ducts, cyclical changes and dilatation might be giving such symptoms.3. Lumps under armpits might be due to enlarged lymph nodes - could be due to any infection / inflammation 4. In your case when you feel the lumps get an ultrasound scan done to confirm the reason.5. Take appointment and let your doctor examine and do needful. Hope it helps you. Anything to ask ? Do not hesitate. Thank you. </s>