Tire is Continental Extremecontact Sport, dated from 2020.

I've been into 2 HPDE events so far, and this year I was planning to be the last one for these tires due to age, just to be safe (6 years seem to be the consensus, even though there's plenty of thread life left).

But after getting the car back from detailing, I noticed these marks on all 4 tires. Maybe those marks were always there and I just never noticed, I only did this time because of the shine product they used, it became more obvious.

Anyway, does anyone know what those mean?

No worries.

It does look a bit like what can happen if a tire is too large or doesn't have enough camber and it is rubbing up against the edge of a wheel well from tight turns, going over curbing or some kind of compression caused from heavy braking or a undulating track.

Im curious if thats the seam between the tread surface and the size wall. If it does not separate, I would run it.

You're good