Hay, yan talaga ang common sa long-term breastfeeding, lalo na kung may slight irritation or friction na nangyari, could be thrush or just surface damage na nag-heal awkwardly, pero kailangan mo talaga i-check with your doctor or lactation consultant para sure ano yan, especially since may pain ka pa. One of my mum friends had something similar and napakabilis ma-resolve once na na-identify kung ano exactly, so huwag mo palampasin ang check-up!
In the meantime, try Mama's Choice Nipple Cream, it's safe for breastfeeding at talagang effective sa irritation, ginagamit ko rin ako noon pag medyo overworked na ang nipples ko. Laban mo yan, mama, nine months is amazing na!