I had a strange feeling in my nipple for about a year, then a lump on my chest wall up high that grew fairly quickly. It felt like a bruise but grew to a golf ball size in about 2 months. Turned out to be pretty aggressive ductal carcinoma. I am now almost 20 years out from my original diagnosis.
I understand not wanting to know, but information is power and time is of the essence. I hope you can find out something soon.