The fact it’s not being quoted as “primary diagnosis” but “impression” and there is no name of a diagnosing doctor being attributed for “superficial burn” both indicate imho that it was likely not the diagnosis of a doctor
No, that’s how medical notes are written in the UK, Australia and NZ. “Impression” is exactly that, the clinical impression. It’s what you’re taught to do - HxPC (history presenting complaint), PMedhx, exam (O/E) and impression followed by plan.
Something this minor wouldn’t have engendered a lengthy history, obvs.