Bacterial infection?

[Mantella19]

In my opinion, it looks like a minor injury. According to several studies, swabbing the wound with Bactine will help prevent a bacterial infection.

MARTIN, D., and H. HONG. 1991. The use of Bactine® in the treatment of open wounds and other lesions in captive anurans. Herpetol Rev 22: 21.

Thanks. I haven't used bactine, but it's already getting better naturally.