Here is what Kevin M. Wright, DVM recommends in AMPHIBIAN MEDICINE and CAPTIVE HUSBANDRY. "Acute clean abrasions require minimal treatment and some abrasions will granulate and re-epithelialized without any effort by the clinician. He goes on to note the size of the abrasion and re-evaluate it in 24 hours to see if it has enlarged. If so, he recommends debriding it by "gently rolling a dry cotton tip applicator across the surface o the wound-" without rubbing or swabbing. Then rinse with a saline solution. The best solution I've found is hyperosmotic ophthalmic solution. Then rinse this off with fresh water in 10 to 15 minutes. (Shouldn't be applied in the normal enclosure, but you have already removed the frog to a separate container.
If this doesn't seem to be working or if it appears to be irritating to the frog, he recommends a Gentamicin-based ophthalmic preparation, 1-2 drops daily. Silver sulfadiazine cream (Silvadene cream) is also mentioned as an alternative.
He also mentions oral care based gels, but some of these contain pain killers and are sometimes used to euthanize frogs, so I would avoid these.
I would personally use "leave it alone" approach unless it is obviously increasing in size and doesn't appear to be healing. My reasoning for this is that handling is always stressful to frogs and one may do more harm than good with treatment unless it is absolutely necessary.
I hope this helps you. You could also contact a herp vet through ARAV if there is one in your area. Click the link and then click on "members," which should give you a list by state and location.
ARAV
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Patty
Pahsimeroi, Idaho
D. auratus blue
D. galactonotus pumpkin orange splash back
D. imitator
D. leucomelas
D. pumilio Bastimentos
D. fantasticus
P. terribilis mint and organe
D. reticulatus
D. castaneoticus
D. azureus
P vittatus
P. lugubris