I had a bad clogged duct a few months ago. After it finally went away, now it seems that the duct is damaged. It is complete flat in that area and doesn't seem to fill with milk there anymore. There is a dent there when I lay down and it also looks faintly bruised in some lighting. Should I be concerned about cancer ? Is this normal? I've had many clogged duct in the past but they all produce milk normally afterward.