Ay, parang lymph node swelling yan na common sa breastfeeding moms, lalo na kung active pa rin ang milk supply mo kahit 4 years na! A few of us had something similar at nag-alala kami din, pero honestly kailangan mo talaga i-check with your doctor para ma-rule out kung it's just hormonal or milk-related swelling versus something else na kailangan ng treatment. Pag may occasional pain pa rin, better safe na mag-consult na lang kasi alam mo na yan peace of mind, wala kaming dapat i-assume dito lalo na may physical bump involved, mama.