Ointments like Neosporin and Triple contain the antibiotic in a petroleum base (think Vaseline). You can use them short-term but as you found out, prolonged use will cause scales to slough off. The good news is that this is temporary and your snake will be ok as long as it's kept in a clean environment.
A better product to use on reptiles is Vetericyn, which you can find at Petco or online from Amazon. Get the gel rather than the liquid/spray as it stays put better. Since it's a water-based gel it doesn't cause scale damage, and it dries in a few minutes rather than being goopy like the ointments so stuff doesn't stick to it.
Silvadene normally requires a prescription to purchase. The only place I've found that will sell it without one is http://www.mountainside-medical.com/
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