Scratch or damage on carbon frame I found this 'scratch' on my carbon frame on top of the front derailleur. Not quite sure when or how it appeared. Could this be more than a scratch?
That's just a light scratch. No issues.

if you are worried that the carbon-fiber composite has been damaged by an impact or scratch, the abrasion is far too shallow for that. It has not even penetrated through the paint.

It's not a crack because cracks do no start in the middle of frame tubes, they propagate from edges or holes.