HELP! Tiny black dots on nipples

I have two tiny black dots on my right nipple (not inside my nipple and not on my areola. It’s just on my nipple) and one on my left. I am not pregnant, I’ve never had sex. I did have my breasts sucked on recently by my significant other. Please someone help me and explain what they are. I’ve tried to look it up but haven’t gotten any good answers.