I hope these pictures are much, much worse than it really is, bscause that looks nasty. It does look bad, but if you don't think a vet visit is in order, I agree, Neosporin. Put the snake on paper towels until it is healed or at least scabbed over.
BTW, I would stop feeding or at the very least feed every other week at best. The wound needs to heal before the next shed, or you may be dealing with this wound for some time.
Good Luck!
Jim Smith