Aw, kailangan mo talaga i-check ito with your doctor as soon as you can, sis, hindi ko ma-assure na okay lang yan based sa feel ko lang, kaya better safe than sorry talaga! A few of my mum friends had similar concerns and ang advice ng pediatrician nila was to get it properly checked first para ma-rule out kung anong type ng cyst or lump ito, kasi may cases na okay lang mag-breastfeed but may times din na may precautions needed. The good news is marami pang nag-breastfeed successfully even may health concerns, pero this one really needs professional eyes, don't stress, dami namang ganyan na nabigyan ng solution, ikaw lang need ng proper diagnosis muna! Goodluck, mama!