That just looks like a shaved shaft… Relax
I also have some weird spots farther up thats under my foreskin that is one shade more yellowish, and more uneven. But they never show because my skin retractes and hides it during an erection. I have had them since always and have never cared about them lately (just some small curiousity when I was like ~12-14 years old), they are rather small and they have always stayed the same. And no one has ever mentioned them.
This just shows that it’s most likely just you who notices.