- Percentage Of People Who Have It: 1 to 10% (based on location)
When you talk about rare genetic traits that most people had no idea about, a preauricular sinus is likely on the top of that list for people. This is a condition that causes a small hole or dimple to develop on the outer ear. It’ll usually be found at the top of the ear where it connects to the side of the head. For most, it can look like the person had their ear pierced. For others, it can look very different.
Of course, most of the time this is merely a hole in the ear and completely harmless. However, this is still a hole in the ear and that can open a person up for infection a bit more than the average person. The reason you’ve likely never heard of this is probably due to it being incredibly uncommon in the far West as well as most of Europe. Only 1% of people there have it. But in Asia and Africa, roughly 4 to 10% of people have this genetic trait.