Could Painful To Touch Lump On Breast Be Serious?

hi my name is idalmis and im 34 years old 8 years back my docotor found a lump on my letf breast and he told me is nathing to worry abaout but now i have pain when i touched steal the same size i have a baby now and i dont have my period for 2 and a have yeras becouse i have a marine anticonseptive