Scratch / damage on carbon seat stay... problematic ?

Hi everyone !

Just bought a second-hand bike and realized it has a scratch on the seat stay. I checked for that kind of damage before buying but for some reason missed it and only saw it when I got home.

I did the coin test and tried to push it with my fingers, it feels OK but I guess it can also be denial ! Sooooo I'd like to have your thoughts... The scratch is quite long but feels smooth on the touch.

I'm planning to take it to a professional tomorrow to have a closer look but I'd like to have a few feedbacks based on the photo.

Thanks a lot !

Thomas