Nose rub on a new BP

[Bogertophis]

While it might have happened during shipping, I'd first be talking to the source I bought the snake from. And you did say it appeared mostly healed, which suggests it happened well before the animal was shipped & therefore should have been disclosed by the seller. It's pretty hard to miss such damage on a snake that one handles to ship, especially when it's right on their nose. The snake probably rubbed her nose trying to escape.

As far as what you can do (other than returning the snake or other adjustment with the source), if it looks bad enough, a vet visit might be in order, but for most superficial scrapes, I'd suggest Vetericyn ointment for reptiles- it's water-based (unlike topical ointments made for humans that can really mess with a snake's skin & future sheds, & those with "pain relief" are toxic to them as well), OR, you can use Betadine (povidone-iodine) diluted to resemble weak tea, which can be dabbed on several times a day with a Q-tip while it heals up.

Snakes with injuries- even minor ones- can be expected to shed more frequently- that's how they make repairs, rather than just to that specific area the way we do. And unfortunately, every time they shed, it can make the injury look worse for a while when the old "scab" gets torn away- so be very patient. Wound healing for a snake is sorta like "2 steps forward & 1 step back"- it can take a while.

This doesn't look too bad but it might also impact the snake's willingness to eat for a while- though if you just got the snake, it's best to wait a week or 2 anyway before offering. Also, the extra handling to medicate the snake may impact the snake's appetite. Long term, the snake might have a minor scar from this, but being a white snake, scars on snakes are usually whitish or faintly pink so that should be the least of your worries.