If you haven’t come across them before, they are called preauricular sinus, and are totally normal thing to have.
Although just under 1% of people in the UK are born with the barely visible holes, in some parts of the world the frequency is far higher and closer to 1 in 10.
Some cultures have created myths around them, including in Ethiopia where they are said to grant wealth. Other myths stated that persons known to have it are 'Hard of Hearing' in the form of being stubborn.
The holes usually appear at the point the ear cartilage connects to the face and can look like ‘nodules, dents and dimples’.
One thing is for sure is that they are definitely not for piercing while the only health complication that may occur is the odd infection which is easily treatable with antibiotics.
According to a study published in the US National Library of Medicine, the congenital disorder was first reported in 1864.
The holes appear during early fetal development and are hereditary.
The cause isn’t known but Business Insider reported that evolutionary biologist, Neil Shubin, theorised they could be an ‘evolutionary remnant of fish gills’.