Faint ring around the edge of my display - getting worst over time

I have been noticing over time a faint ring around the edges of my display - mostly prevalent when screen is blank (I.e. rebooting) but is present at all times. It's color is faint gray and seems to be getting more noticeable over time. It's not a big issue - just wondering what it could be. It's possible that this imac is simply aging - it's on its 5th year. And, running strong!

Interesting. Can you post pics of the "ring"?  Does the ring occur around areas of greatest use or or wear?

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