Hi there,
I don't think that's a burn of any kind, in fact it looks like an ulcer (yes, fish can get them!). I'm not very aware on how to cure ulcers... i've seen plenty of pictures and it looks similar to your fish. I've heard there is 90% chance of survival if you act against them - quickly. (so no worries ).
Here's an informative website:
http://www.fishdoc.co.uk/disease/ulcers.htm
If that doesn't help, pop down to your LFS and you'll find some stuff that will help the fish, for the time being, i suggest seperating the unwell fish from the others and keeping it on it's own until it recovers.
Good luck.
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