Ay sis, napakaimportante nito, please check with your OB or lactation consultant agad kasi hindi dapat basta-basta i-ignore ang ganyan, lalo na kung masakit talaga pag napipilitan mo. Kami ng kaibigan ko, may isa rin na nag-alala ng ganyan at nalabas na blocked duct talaga, kaya nag-warm compress, frequent feeding, at proper latching, tumulong dun, pero may iba ring possibilities na kailangan i-rule out ng doctor para safe ka talaga. Huwag mag-alala sobra but do get it checked out soon, okay? Good luck sis, praying it's something simple lang!