I have tried beveling it but it doesn’t work, it doesn’t even show up.
It isn’t a texture issue.
It isn’t a merging issue.
and also I used the cloth brush in sculpting mode and then this problem showed up.
Any ideas on what the problem could be?
Since this is a mesh issue, based off info and what I personally know, this might work: Hold “alt” and click a vert in that line that you’ve circled in red, that should select everything in that “line”. You can then resize things to be on the same x,y, or z axis to make it not as jagged.
You could also manually move each vert, but that would take a lot more time.
Edit: there’s many ways to solve this issue. You could also delete the verts (black circle things) you don’t like, then highlight the surrounding area and fill it in with the F key. C is the selection tool I believe.