who has seen this before

[Lord Sorril]

I haven't seen patterning like this in a normal situation.

I have seen dorsal scale damage turning the scales white from a ball python attempting to force a lid off a plastic bin (the snake tries to force the cage open and the edge of the lid flexes and creates a small gap that pinches the back). In the case of some cheap bins with molded plastic indents for handles-the damage can be extensive.

I have also seen 'rescue' snakes with dorsal white scales from healed up rodent damage.