Is this a scale issue?

I'm worried this may be a form of scale rot or another issue. He had gotten darker as he got older so recently when these spots popped up I figured it was for the same reason. But there seems to be more now. Is this a scale problem or could it just be his natural colors?

http://i111.photobucket.com/albums/n...130_211404.jpg

Just color if it's what I think you're referring to.

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