Back of my foot hurts and not sure if it’s my shoe

I wear a size 11 shoe, and it seems like my shoes still have some room to be filled still, but I think the skin on the back of my right foot peeled off and now it kinda hurts whenever I walk. My left foot is fine, and it feels like the shoe is pretty comfortable, but my right peeled off and now it hurts to walk with this shoe on. Could it have been caused by the shoe?