Not very close, but from "here" it's just a minor head rub. A tiny bit of Neosporin (what's left now) is just fine...but don't use (or keep using much) unless skin is
broken*. (*that may be what you are calling a "rash" but I still can't see it, so...) Better to use on snake wounds is Vetericyn, it's a water-based topical antiseptic
gel for use on snakes. (Neosporin is petroleum-based, that's what messes up scales if much is used.) You can also use a dab of Betadine.
Head rubs are fairly common, & can leave a scar that goes from pink, then to white, but may or may not fully go back to original color & scales. Should improve
very gradually after many sheds, but prevent rubs if you can figure out what your snake is pushing on...often it's just the cage top though.