Ok, for a few years now, I have had a small little white ball type of thing on the side of my boob.I wouldn't say ball..it kinda looks more like a lil bump.It has never been painful and it has never increased in size (except for discharge) If I squeeze my boob when the spot is, it is flat..except for every couple of weeks or so I notice that it starts to get a little hard and I will squeeze it (painless) and notice a whiteish discharge come out of it.It isn't liquidy but isn't exactly hard either.

Any idea of what it is? anybody else experience this?