Impossible to diagnose from images, perhaps a vet with herp background could say.
An open wound could become infected if not already, that would mean treatment.
It may be nothing of concern if it isn't bothering your frog at all and they can't tell you other than body language.
You could try a topical antibiotic like Neosporin, just a light application, perhaps daily, and see if it improves at all.
Again, I think a vet is your best option, then go from there.