That tiny hole right at the spot where your ear meets your cheek is called a preauricular pit (or a preauricular sinus).
If you or someone you know has one, here is what it actually means:
1. It’s an Embryological Remnant
Preauricular pits are congenital, meaning people are born with them. During the early weeks of embryonic development (around the sixth week of pregnancy), the outer ear develops from multiple small tissue buds (called the hillocks of His). If those areas don’t completely fuse together, a tiny dimple or opening remains.
2. It’s Surprisingly Common (and Harmless)
Depending on the region and population, anywhere from less than 1% to up to 10% of people have them. In most cases, they are entirely harmless anatomical quirks. They often run in families, and many people live their entire lives without ever experiencing a single issue.
3. What’s Hiding Underneath?
While it looks like a simple pinhole, it actually marks the entrance to a narrow sinus tract (a small tunnel) that tunnels a short way under the skin. Because it’s a blind pouch, dead skin cells, oils, and bacteria can occasionally collect inside it.
When to Pay Attention to It
For most people, a preauricular pit requires no medical attention. However, because it can trap bacteria, it does carry a small risk of developing complications:
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Infections: If bacteria get trapped, the area can become red, swollen, tender, or start discharging fluid.
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Cysts: A small, painless lump or cyst can occasionally form underneath or near the opening.
If an infection happens, it is usually managed with antibiotics. If someone experiences repeated, chronic infections, a doctor or an ear, nose, and throat (ENT) specialist may recommend a minor surgical procedure to completely remove the tract. Otherwise, it’s best left alone—no picking, squeezing, or trying to stick cotton swabs into it!
Do you have one of these pits yourself, or were you just curious about what causes them?
