Hopefully it's alright. Obviously don't continue applying it though (:
What I would do is put the frog into a hospital set-up to minimise the chance of infection if its an open wound or scratch.
Sterilise the tank and anything you put into it, and replace the paper towelling substrate daily. You can go as far as boiling the soaking/misting water to remove bacteria, letting it cool down, then adding your water treatment.