I am a 39 year old otherwise healthy female, no kids. History of fibroadenoma, last ultrasound Ausgust 2016, all fine. Three days ago, getting out of shower, I noticed a lump on my right nipple - on the nipple itself, not areola, sitting just above the opening. It is a smooth raised, part of the nipple, I have no pain, dryness, itch or discharge. It goes creamy/white when cold, then reverts to normal colour when I warm up. I have prodded at it a bit, when I push the nipple inward for a moment and it then pops out, most of the nipple is the usual colour but this lump is completely creamy/white, it slowly turns back to red. Any suggestions? Could something sinister appear in a few days?