Bubble-like Bumps?

I have white bubble-like bumps on both of my nipples. They r small and round maybe 2 millimeters. And I have brown blotches on my skin above my right nipple. They started to form a few years ago, but they weren't really noticeable. Now i'm almost 16 and it's been about 4 years and I have more of them(maybe 10 on each)they don't seem to be getting any worse or better(i haven't been getting any more). The blotchyness and bumps formed around the same time so I figured that they might be connected. I know that puckering of the nipple, pea-sized lumps, or nipple discharge can be a sign of cancer. And I give myself regular self-exams and haven't found any other abnormalities. I'm just worried because I don't understand and haven't been able to find any information related with these types of bumps and cancer. If anyone has any information or assumptions about this it would be greatly appreciated, if shared.
Thank you