Hello. Im a 26 year old female In April 2016 I have diagnosed with an axillary tail in the right breast which is extended in my right armpit. I did needle test to diagnose whether it is a cancer symptom or not. All my reports were normal. The doctor said that it is not a cancer symptom, as just it is an extension of axillary tail. It was a small lump before 6 months. From 1 month its size is increasing. I want to why it's size is increasing and what kind of treatment we have for this axillary tale extension?