Hi Nikki, sorry you had to join the forum under such circumstances but it's nice to meet you.
It sounds to me by the scab that your frog has a "noserub". This is what happens when your frog attempts to escape the tank and presses and rubs his nose against the glass or screen top to try and get out. You should post pictures though, because this is not a definitive answer and you could have a different problem on your hands. If it IS a noserub, and it might not be, you can treat with neosporin if you must. If you do get the kind WITHOUT PAIN RELIEF as this will kill your frog. Do not attempt to use any other chemicals either, neosporin is the only human type over the counter antibacterial ointment I have ever and will ever use. Just apply a little to the affected area with a QTip every night after the frog wakes up. Also, this treatment is not intended for long term use and is supposed to prevent an infection, nothing else. It may heal faster with use of neosporin, but as soon as you see the wound beginning to close, stop using it, I don't know the long term effects. When my White's Tree Frog had an open wound on his leg I used neosporin for three days total and they healed up without incident. Try not to get the ointment on your frog's nostrils when you apply it too, as I don't know what could happen if they breathe it in.
How big is the enclosure you have him in? Also post your exact temps and humidity, what substrate you're using, and preferably a picture of the set up just in case there's a problem with that. And do you know if the frog is wild caught or captive bred? This could be a determining factor in what is wrong.
I hope this helps, if you use the neosporin make sure to follow the guidelines I've put up and remember: NO PAIN RELIEF, this will KILL YOUR FROG.