If you have any silvadene/silver sulfadiazine cream, you could apply that and monitor for healing. Good job getting the duct tape off. I've used duct tape to trap a wayward corn snake in a government building (stay of execution before they determined its fate). It took me over an hour and a half with Q-tips and oil to successfully extricate him from the tape. But he was totally unharmed. Impatience can be disastrous. The key is patience, and you did it! Good luck!