Shoe Bites ?
Usually due to overly firm leather or material. Or sometimes there can just be a little piece of stitching that catches you at the wrong angle. Mostly happens with cheaper shoes especially sandals etc. Vaseline might help, I’ve used fairy liquid with warm water in the past and aggressively massaged it into the part that cuts you, worked well. Also if you put egg white on your chaffed heels it sorts them right out 😉