hi there, a family history of ca breast has a very high incidence of breast cancer
and so if you have a lump it is best to get a biopsy
done to rule out any possiblity of cancer. Early detection and treatment have an increased survival rate
and is amenable to surgical cure. In fact you should consult with a genecist who can suggest tests in which they are able to do cytogenetic study which will be able to predict your chances of being cancer free and if not whether any preventive measure can be taken for a definitive treatment. Do follow your doctors advise and get a biopsy done. Take care.