research Morgellons black specks. I have it. started in stool. Keep it at bay before it gets worse. It is systemic. Try some remedies. No cure yet, not considered real. people pegged as delusional just like first aides patients were treated. It is real. Had I known the symptoms I might have avoided the horrific skin affliction. Ther is a gastro doctor studying this and doing colonoscopy studies. dont know name but look for him.
i had the same problem and asked my doc about it. she didn't think it was anything to worry about. just to figure it out for myself, i began tracking the issue and noticed that the black specks happen when i'm taking my citrucel (insoluble fiber dietary aid; i take the tablet form). it goes away when i stop my citrucel.
by the way, this is not to diss the citrucel; it does its job quite well. the specks are pretty weird, tho.
hope this helps