I you are still using triple antibiotic stop using it. Anything like that will turn the scales into mush. It actually does more harm than good. Unfortunately not many people know this. What you should use instead is Betadine (which can be purchased at most pharmacies over the counter.
Heating pads get far too hot, without a thermostat to regulate they can easily get to 150 + degrees this is hot enough to kill your snake.