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This could be mastitis, breast abscess, in rare case a recurrence, etc.
Are you lactating at the moment and do you ave any asociated clinical features of nipple discharge/redness/ soreness?
You should get a clinical examination and see if your physician wants to prescribe any antibiotics or painkillers.
He/she might want to run you through some tests including blood tests, and maybe a mammography. Nothing can be said for sure without a clinical examination.
Let us know about how you are doing and if you have any other doubts.
Regards.