I have a Preauricular sinus and never knew it. These are common congenital malformations first described by Heusinger in 1864. Both sexes can have one. In females, it is commonly found outside the right ear.
Theories of origin of preauricular sinus (also known as a
congenital auricular fistula) includes: defective or incomplete
fusion of the beginnings of the external ears at the embryonic
stage. Just one third of folks even know they have one.
The sinus may be bilateral (both ears) in 25-50% of cases, and
bilateral sinuses are more likely to be hereditary. In
unilateral cases, the left side is more commonly affected. They
are usually benign and do not change through life.
On Facebook, people
with a preauricular sinus believe they are special. Neil Shubin,
an evolutionary biologist, has a highly speculative theory that
the holes could be an "evolutionary remnant of fish gills."
In Taiwan, the
incidence of preauricular sinuses is estimated to be 1.6-2.5%;
in Scotland, 0.06%; and in Hungary, 0.47%. In some parts of Asia
and Africa, the incidence is estimated to be 4-10%. Just 0.1
percent of the population have it in the US, and 0.9 percent in
the UK. Bottom line, I always knew I was special, now I can
prove it. Ha