How are you? It's good that your mammogram and ultrasound are normal, erasing any doubts of cancer in your breast. Paget's disease of the breast is a rare form of breast cancer and starts in the breast ducts and extends to the areola. In the early stages of the disease, you might notice only some flaky or scaly skin on your nipple, accompanied by slight itching or redness which might ooze or become crusty. You can read more about this through this link: http://www.mayoclinic.com/health/pagets-disease-of-the-breast/DS00771
Perimenopause, on the other hand, means the menopause transition years, the years both before and after the last period. The production of most of the reproductive hormones diminishes and becomes more irregular resulting to hot flashes, mood changes, insomnia, fatigue, memory problems, itchiness, skin thinning and becoming drier. (http://en.wikipedia.org/wiki/Menopause)
If you notice that your skin condition does not resolve with vaseline, it would be best to make a follow-up with your doctor for proper evaluation. I hope this helps. Take care and keep us posted.
And just to clarify there is no nipple discharge.