Adam, I think I've heard about that from somewhere before as well. Didn't you have an experience with the "pain relief" ointment a while back?
Anyway,(to the original poster) it sounds like everything is now under control, and it only being approx. one inch, isn't quite as bad as I originally thought. As Adam mentioned, the tail ain't growin' back, but until it DOES fall completely off, dab some "regular" Neosporine on it, and continue for a bit AFTER it falls off too, and that'll be the end of it. This happens to snake's fairly often that are neglected, and not given the correct environment,....low humidity being a typical cause, and secondly, shed's never checked to see that they come off completely.
BTW, while we're on this shedding subject, in the future, make absolutely CERTAIN that any future sheds the snake makes, come off completely, paying close attention to the eye-caps(ocular scales), and of course, the tail tip(or what's left of it..LOL!)
if the eye-caps do not come off with every successive shed, HUGE problems can arise!
Good luck with your new Sinaloan!
~Doug

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"Better to be silent and thought a fool, than to open mouth and remove any doubt!"