HI,Welcome with your query to HCM.
Based on the facts of your query,the cause seems to be
Fibroadenosis which is a benign condition with
Hormonal imbalance.check if your menses are nearing.Increased vascularity might explain small bumps on your skin.
In my opinion you seems to be having -Fibroadenosis,with sore tender breast tissue and the armpit-due to axillary tail tender breast.
Mammography and FNAC
Biopsy would fix the cause from your Surgeon.
Hope you got the answer for your query.
Hope this would help you.
Welcome for any further query in this regard
Will appreciate writing your feedback review comments,to help the needy patients like you at HCM.
Good Day!!
Dr.Savaskar,
Senior Surgical Specialist
M.S.Genl-CVTS