the.com/discoloration

The body's way of leaving a paper trail after something went wrong.

means A patch of skin (or other material) that has changed from its normal color, usually from bruising, aging, staining, or damage.

from Built from the Latin-rooted 'color' plus the negating/reversing prefix 'dis-', so the word literally means 'un-coloring' — the undoing of a thing's proper hue. It passed through French before settling into English, where 'dis-' has long done this quiet work of reversal, as in 'disconnect' or 'disfigure.'

bruise logic
Color changes as blood pigment breaks down in stages
not always harm
Can be genetic, sun-caused, or just aging skin
teeth version
Often from minerals or old nerve damage, not brushing
fades slowly
Full skin recovery can take weeks after injury
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