TMI and possibly sensitive subject but basically on one of my areola I’ve noticed like a dip/dent/ inward curve... I’m breastfeeding so does anyone know if that’s normal, even though it’s only on one side? I honestly don’t know how long the ‘dent’ has been there?

Has any other breastfeeding mamas experienced this? I have a doctor appointment tomorrow but just wanted to see if it’s normal?