Ay, sa CS tahi yan usually ang dissolvable sutures na ginagamit nila, kaya most likely mawawala siya on its own within 1-2 weeks as your body absorbs it, pero honestly, better to message your OB agad lang to confirm kung ano talaga yung lumabas para sure ka, kasi gusto mo lang na mawala ng maayos at walang infection. One of my mum friends had something similar and her doctor just assured her it's normal, pero important talaga na itanong mo direct sa kanilang dahil ikaw ang alam mo best kung paano ang healing mo.