Abscess

[Bogertophis]

If you looked at the links I posted, the first one is way worse than your snake, & what I HOPE yours doesn't turn into- & it's not even the worst I've seen on this forum.
I just grabbed a few that had a similar issue to yours to help you understand, I'm sure there's others...

For what it's worth, my options are worse than yours for locally treating snakes...I do understand. I also don't think it will matter much, following her advice for the
duration of this week & then seeing if it's better or worse. We are just trying to help you understand what is typical treatment for these situations, hoping for the best
for you & your pet, and hoping to help you ask the right questions when you see her again.

[ShawarmaPoutine]

Hey, you can always learn from criticism. If you don’t gain knowledge from it, then perhaps some humility.

[Bogertophis]

Hey, you can always learn from criticism. If you don’t gain knowledge from it, then perhaps some humility.

Please don't take our comments as criticism...we're just trying to help you with something many of us have seen before. Trust me, no one "knows everything"...
that's why we have a forum...to share tips. And we're not vets, nor are we seeing your snake (in a real life clinic), just experienced keepers.