these bumps in the breast ( both of them , i assume?)most likely are fibroadenomas ( or milder versions)that is the ducts and the lining of the milk glands get thickened. this can affect some or few glands and ducts causing them to bump against you palm during examination. depending on the age you have to give it priority to eliminate the possiblity of cancer. women( or even men) with bumps in thier breast with following have to get is examined by a surgeon or gynacologist- lump growing in size,in one or both breasts, secretions from nipple, painful or painless, smaller bumps in the armpit ot neck region. i know someone who had similar bumps, freaked out claiming it was cancer, did a mammogram, relieved to hear it was only fibroadenomas. :-)
take care.