I found a lump under my armpit about 6 months ago am now getting it looked into. It is painless, indentation formed at lower edge, about 1 cm, hard and immovable. It has been slowly getting larger over the last six months. I have been on antibiotics for 7 days (875mg 2x day)to rule out an abcess, this has not changed the condition of my lump. I am 26, been on birth control pills for 11 years, smoked for 12, mother had breast cancer at 44, started menstrating at age 11, and over weight. Based on my risk factors and the condition of my lump, should I be concerned about cancer or is there any other condition that would manifest itself with a lump of this nature?
Thank you for your time.