Brazilian Rainbow Boa on craigslist...

[EricIvins]

I agree completely that they look like scars...but the person I talked to about it has produced more snakes than I will likely keep in my lifetime and I trust her opinion more than my own on things or a serpentine nature. I find it hard to believe but I find it even harder to doubt her opinion.
I wish I could breed it, but that would imply that I had it, and I don't...I haven't kept BRB's in more than 3 years and probably won't be keeping them anytime soon (focusing too much on fish and dart frogs at the moment).

The scales don't have to be distorted to be a scar, and in a few years, that white patch could be black or orange, or any range of colors. It will never go back to its normal coloration, but this is common with BRBs. I've seen quite a few Imports with the same white patches, and aside from a couple Calicos, its nothing special. With every shed that animal goes through, the pigment in and around the spot will change. Most thin skinned Boids will do this. I had a Green Tree with the same thing going on, and from start to finish took 3 years. But the scar tissue went from Pied white, to orange, to black, then curlean Blue. If that animal were a Calico, it would look completely different........

 

[A. gigas]

WANT.
that is a beautiful rainbow boa!