Blister thing on nipple

Gabriela

Wondering if anyone has an idea on what this is? My sons almost 12 months so we’ve been breastfeeding a while. He recently got a tooth so wondering if from that? Does hurt when I breastfeed on this side. Other side is fine. Is it safe to continue breastfeeding? Should I see a doctor? I’m just paranoid because my son has had a fever so wondering like do i have an infection and i infected him? 😅