In my experience with dealing with scale rot, burns and trauma; that's not really what I'm seeing. It looks to me either like dye transfer or a skin reaction to the substrate. With that said you should try getting the animal off of the eco-sub and onto paper towel. I saw you mention something about adding Moss to up the humidity but I strongly recommend against it. If by some chance it is mild scale rot, or a bacterial infection or some other skin issue you run the risk of exasperating the issue. Keep it on paper towel, keep it dry and keep an eye on it. If it starts to get better then you can move it to aspen or one of the drier substrates but unless it's in shed I recommend against high humidity for reptiles showing skin issues.
Just my 0.02 from 10 years of keeping -best of luck.
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