Cleft chins, or butt chins are they're colloquially called, are a result of an unfused jaw bone. The skin over the tiny gap is indented, creating the dimple. If you ever feel a cleft chin, you can actually feel the gap, but don't worry, this anatomical feature is harmless.

What does a dimple in the chin mean?

The dimple happens to be a result of asymmetry in the jaw line. For those born with it, the jaw develops as two separate halves on a foetus and when there is slight deviation in alignment during the fusing of the two halves it results in cleft chin.

Is a dimpled chin genetic?

A chin dimple, or cleft chin, can be hereditary, and passed down in what is known as a dominant trait. Our parents each give us one version of the gene involved in this trait. ... It is less likely, but not impossible, to inherit no cleft versions of the gene and still have a cleft chin.