Do you have one of these? Or do you know someone who does?
Some people are born with tiny, barely visible holes above their ears.
It affects a very small percentage of people and is called preauricular sinus.
In the UK, just under one per cent of people have them. In the US, the frequency is lower, and in Asia and parts of Africa, around four to ten per cent of people may be affected.
Simply put, the malformations are 'nodules, dents, or dimples' that are exposed anywhere around the external ear – specifically, where the 'face' and the ear cartilage meet.
The preauricular sinus is, technically, a hereditary birth defect that, according to The Mirror , was first documented by a scientist called Van Heusinger in 1864. Usually they're found on one side, but up to 50 per cent of people have them on both.
According to Business Insider, one evolutionary biologist, Neil Shubin, says the holes could be an "evolutionary remnant of fish gills."
But if you are part of the one per cent, there's not really anything to worry about. They might be linked to other things, but don't tend to cause problems. The most likely issue is for the holes to become infected, something that's easily treated with antibiotics.