Question to black milk owners

[Andy_G]

I have found a lot more pics recently of black milks and I have been puzzled as to what the lighter spot on my male is (around his neck area) because I haven't really seen it in any other pics...could it be a scar of some sort or is this spot normal?

[Andy_G]

Here is an older pic that shows the mark fairly well. What could it be? :/ The light spot itself is on both sides but as you can see on the first pic there is like a small indent in his neck where it is.