Performed ghusl 3 times

I had to make ghusl after my period the night before i had a shower before ghusl, i did ghusl the first time then did it an additional time to make sure and then did it in warmer water after my shower i rubbed my skin and saw black and grey come off i’m not sure if this is a barrier simply because i cant see it nor feel it in my daily activities and my pores had opened up so i scrubbed the limbs in which i saw this from vigorously and then began to be very nervous as i also suffer from waswas but islamqa had said dirt from the body isn’t a barrier but i’m still confused. i did ghusl again for the 3rd time and after wards rubbed my stomach and saw this and washed it seperatly but is this a barrier it’s not hard not visible