If you're in the U.K. and you were to have rounded up 100 people, there's a good chance that at least one of those people have one of these tiny little holes above their ears. It's estimated that only 1% of people born in the U.K. have these holes, though in certain localities it can climb as high as one in ten (10%).
In some cultures, they are thought to attract wealth, but naturally, that is just superstition. They tend to appear right where the ear cartilage connects to the face, and usually resemble nodules, dents, and/or dimples.
It may look as though these are piercings, but they're not! There's also a small chance that the hole could become infected, but it's usually cleared up with a quick course of antibiotics. This congenital condition was first reported in 1864, and was recorded in the U.S. National Library of Congress.
These holes are usually hereditary and tend to appear early on during fetal development. Nobody knows why they're there, but some theorize that they may be evidence of vestigial fish gills.
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H/T: Aunty Acid