Quit putting stuff on there IMMEDIATELY. ESPECIALLY the neo. It sounds to me like it's either just the way the scales bends from coiling one direction all the time or the snake managed to get in a tight squeeze and damaged the scales. Do not ever use neosporin on a snake without any visible flesh wounds. Neosporin is bad for them and should still even be used sparingly if they are injured. Unless the scales are discolored it's likely from some minor damage or is just the way her scales bend and you can't do anything about it but to wait for her to shed