Actually mouth rot usually looks like this
see the white cheesy looking yuk? Also see The puffy redness? Classic signs of mouth rot on this rescue tokay gecko I received a couple years ago.
Scale Rot- blisters on scales, or scales that are red,flaking off,or looking pretty yucky.
Here's another case I took in he actually had a slight case that went away pretty quickly. But you'll see the brown yucky looking scales.