Black kitty nipples.. that I pulled off!!!

Has anyone ever experienced their cats nipples turning black? My cat had about 3 black nipples and to my absolute shock, I pulled them and they came off!! [emoji]128563[/emoji][emoji]128563[/emoji][emoji]128563[/emoji]

WHAT?????  I've never heard of such a thing?  So there is nothing there now?  Just flatness?  Or was this like a covering that came off and there are still nipples underneath?

Sometimes nipples will get scabby (??? I don't know why, maybe the cat bit them while grooming. Or from chafing ) and the scabs come off. Probably what happened.

there's no flatness, the blackness was on top of the nipple i literally have thought that her nipples were just naturally black for all this time then when I was stroking her I just noticed it looked like it was falling off, I pulled it and it came off but there's a pink little nipple underneath still, very very weird [emoji]128563[/emoji][emoji]128563[/emoji]