Those little indentations that appear on our cheeks when we smile have captivated people for generations. They’re often associated with tenderness, youth, and joy, but behind their apparent simplicity lies a fascinating combination of anatomy, genetic inheritance, and population variations. Far from being a mere aesthetic detail, dimples are the result of a particular muscular and cutaneous architecture that’s worth exploring in depth. Anatomy Barbecues and Grills
The explanation for these indentations begins with a specific facial muscle: the zygomaticus major. Its usual function is to raise the corners of the lips when we smile, allowing that universal expression of joy. However, in some people, this muscle has a very particular structural variation: it divides into two independent fascicles or muscle bundles.
This bifurcation causes the skin to be pulled unevenly when it contracts during a smile. The result is that small, visible depression on the cheek that we call a dimple. It is, therefore, a congenital characteristic of the muscle tissue, not a defect or a medical condition.
The Role of Subcutaneous Tissue
Muscles are not the only determining factor. The thickness of the fat layer under the skin also decisively influences the visibility of the dimple. When the adipose tissue is thinner, the indentation is more pronounced. Conversely, in faces with fuller cheeks, the dimple may be less prominent or even disappear completely. This explains why some people notice their dimples becoming more or less evident depending on weight fluctuations throughout their lives.
A genetic inheritance that follows its own rules.
If you have dimples, it’s very likely you inherited them from one of your parents. Geneticists explain that this trait is transmitted under a pattern called autosomal dominant. In simple terms, this means that if just one parent carries this characteristic, there’s a high probability it will appear in their children.
However, human genetics doesn’t always behave like a perfect manual. There are cases of people who develop dimples without any obvious family history, as well as the opposite situation where they fade over the years. The natural loss of skin elasticity during aging can modify the appearance of these marks, making them less noticeable or changing their shape.
A surprising distribution around the world.
Although many consider dimples to be an uncommon trait, statistics tell a different story. Various studies conducted in different regions of the world show striking figures regarding their prevalence:
