A couple of my bags had tiny holes like that, I used the head of a big sewing needle, pushed some leather glue through the hole onto the underside of pipping, then pressed down so the piping was glued down. Cleaned off the excess glue then let it dry. After that touched up with puff paint to disguise it.It is minor, I agree. That is why I want to address it now before it turns into a mess. I do have some paint that I can apply and fix it right up.
Is there anything else I can do to permanently prevent further wear of the leather on that corner? It sort of feels like the leather there is worn down very thin whereas in other areas the rolled edge gives a slight bit to a squeeze with the fingertips, like it its thicker.
E6000 or Shoe Goo is very good for this purpose, since they are not running, pretty much no mess at all.