Another possibility is that the linoleum is discolored from moisture getting under it around the edges of the floor register. I've seen flooring turn dark due to leakage. Maybe it's getting wet from normal foot traffic or washing the floor?
If you can touch the register its definitely not hot enough to scorch or char anything.
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2018 Keystone Cougar 22RBS
2020 Ford F-350 XLT SC SRW 6.7l Powerstroke.
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