Black stuff coming off on finger when I touch my scalp?

[Jane123]

IF ANYONE WANTS TO SEE A PICTURE, I'VE ATTACHED ONE IN THIS OTHER FORUM:
https://patient.info/forums/discuss/...-scalp--584268

The black stuff looks similar to the stuff on the picture of the face wipe attached (I used this picture because you can only see them in a photo when they're concentrated together like that. On my finger they show up in much smaller amounts and more dispersed). Thanks