You can put Neosporine on his little hand and it will heal up ok. Just make sure you DO NOT use the stuff with pain relief as it will kill them. The regular Neosporine is safe and recomended, but the stuff with pain relief is actually used to humanly euthanize frogs, so make sure you have the correct stuff. Also if you are worried that it will get infected, strip the tank down to just white paper towels, a place to hide, and a water bowl for a soaking pond. Then you can monitor the tank for anything that might cause an infection and also you will know if the little hand bleeds or not. I would keep it to the stripped down tank until it is completely healed so he does not re-injure himself digging in the substraight. Also make sure you have the little guy in a warm room, he will heal faster if the temp is a little warmer. God luck with the little guy, it sounds like he is in good hands! I hope my advice helped?