Can someone help me identify what's wrong with my ball python? Looks like mouth sore

[Bluebonnet Herp]

Little under two years old, little over 400 grams.
We got her at a pet shop when she was young. We've personally only had her since last February. They didn't tell us her exact age y'know.

I don't mean to hijack the thread, but I've had yearlings twice this size. You sure it's not maybe just a few months old? At 2 years old, it'd have to be at least 1,000 grams I'd think...