No matter what color the scar or burn may start out to be, it will usually turn white as it no longers 'supports' that area. This is also in aid to healing and eventually those scales would probably shed off.
It should evenually heal, considering you keep it clean and dry, and it may regenerate the scales over the area, or may just be a scar.
I had a hypo boa left out in the sun, by the person I bought it from. It overheated the animal and it immediately went into shed and shed too soon... this seemingly ripped off many scales and lots of color!
At first, all the affected area was snow white. Then it all turned pitch black. Little by little, and I mean very slowly, over a 3 year period, it cleared up to the point where you would never know what happened.
When I received her, she almost looked anery!!!!!!
When I sold her she looked like a nice hypo!
If the burn went below the skin, I would seek Vet assistance.
If not, i would keep it clean and dry, and with a little patience, all should be well.
Take care, Joe
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Thanks and take care - Joe Rollo
'Tis not the stongest of the species that will eventually survive, nor the most intelligent, but the one most responsive to change' Charles Darwin