After a few painful nursing sessions today I see that my little nemesis Bleb is back! I had one on 3-4 Jan, one on the 13th, and here we are right on schedule. I think it's a bleb and not a milk blister because it doesn't bump up when I apply pressure. What are they caused by and how can I stop this thing from coming back? Last time I just picked at it and it went away in a day or two, but it hurt like hell. (Btw - EBFing for just over 6 months now).