Tinted window maintenance/repair question

I just noticed that there is a pea-sized circle of tint missing from one of the back windows in my car. It doesn’t look too bad, but I am worried about it getting worse. Is there something I can/should do to make sure that this doesn’t spread? I can only guess that the corner of my dog crate rubbed against the window and took the tint off. Normally there is no one/nothing in my back seat.

in this heat any little bump will scratch it.nothing you can do.well other than patching it and that takes skill.