It might not mean anything. I have a ph caramel glow female that has a distinct head mark, but it doesn't look anything like what my spotnoses have. Also with spotnoses they tend to be more of a khaki color with jet black pattern.
My ph with the head pattern (she's the super light one):
My female spotnose:
You can see her head pattern, but also how dark her black is. Also they don't always have a horse shoe shape. My male has a Christmas tree on his head.
Here is my male:
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