Phantome ~
Like Kelli says, it can be a sign of breast cancer, always better to get these things checked out. Just thought I would tell you though ... a friend of mine had a similar experience and she lost whitish liquid and yellow pus from one nipple. She got checked out at the doctors, and it turned out to be nothing more than an infection - possibly caused by a bit of rust on the metal from the clothes peg?? Who knows?? Anyway, it cleared up after a week's treatment of penicillin.
Get yourself to the doctors and get some peace of mind!
Hope all turns out ok
Mistress Raven xx