For that photo specifically, it looks like it's most likely from some kind of damage, probably from rubbing. However, yes, snake markings/colours can change slightly over time! My BP didn't have much of a head stamp when he was a baby, but after he grew up, the colours on his head changed a bit and certain markings on the sides of his face that were previously invisible became clear.
My BP has also gotten some mild injuries from head rubbing during the months when he's looking to breed. I treated them with Vetericyn and they healed up well, but the scales where the injuries were previously turned white.
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