Black dots appeared on the nipple. What is it?
There are only two options:
1) Pigmentation. Age spots may appear on the skin. So if you are not 20 for a long time, then this is pigmentation.
2) Check for seals, changes in the shape of the breast, bumps, pain when plucking the breast, and there should be no discharge from the breast when pressing on the nipple.
Most importantly, whatever you have, be sure to visit a doctor! You should also be wary if your chest periodically hurts, etc.
And this is urgent to see a doctor, if only not dirt, if you run it, you can then get under the knife ... do not take risks and do not be afraid, go for a consultation!