Ay mama, normal lang yan na may lumabas na gatas pa even after you've stopped, nangyayari yan sa marami sa amin kasi ang katawan needs time to fully dry up, usually takes weeks or months pa. But yung bilog na nakita mo, honestly better mag-check ka with your OB or lactation consultant para sure, kasi sometimes it can be just accumulated milk but mas peace of mind if may professional na tiningnan, lalo na kung may pain or it's getting bigger, a few of us had similar situations at nag-consult lang and okay naman turned out to be, pero better safe talaga!