If the lumps in the breasts are not milk collection in lacteals then they are most probably fat lumps under the skin which occur due to deposition of fat under the breast skin and can emulate lumps. It is harmless generally but may become painful in cases of fat necrosis or injury suffered during breast stimulation or foreplay.
It is advisable that you may visit your physician for a local beast examination to rule out the cause. Also you may use hot fomentation twice a day to alleviate the pain.
I hope i have answered your query in detail,
wishing you good health,
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