awe! that would suck. I would say if there is anything about your snake that you question and know you cannot help with yourself, a vet visit doesnt hurt. It isnt too pricey for a checkup and if meds are needed, they arent too expensive either. My vet bill for a checkup when i thought my bp had mouth rot cost me $60 to get checked and $20 for his meds and needles. It was way worth it to feel assured that he was healthy whether i was right about the mouth rot or not. If you are just curious about what it looks like and do not suspect you bp has it then the picture above it a perfect example. I think milder cases of it can appear in a number of ways, most of which are redness or discoloration of the scales. Also as far as I know scale rot may not be caused by external environment only, it can happen from the inside out, or at least that is what i have heard.
Thats my 2 cents, correct me if anything seems inaccurate