I have a small lump in my left breast that I noticed today. I may have noticed it earlier, but I probably assumed it was a plugged duct or engorgement. It doesn't hurt and so far it hasn't gone away with nursing. I'm going to make an appointment to get it looked at, but I'm wondering what the odds are that it's a plugged duct or something related to breastfeeding.

Do plugged ducts always hurt? Can they stick around even after you've nursed/pumped? I'm worrying that it's something more serious, which is why I'm going to make an OB appointment