A dimple is a small natural indentation in the flesh on a part of the human body, most notably in the cheek or on the chin.
Dimples may appear and disappear over an extended period. Dimples may play a role in sexual selection. Some cultures, for example Asian

Asian people

Asian people or Asiatic people is a term with multiple meanings that refers to people who descend from a portion of Asia's population.- Central Asia :...

 and Indo-ethnic sub-groups, prefer dimples as a sign of attractiveness and veracity. Dimples may be genetically inherited and have been called a simple dominant trait, but there is no scientific evidence for this.
Dimples may be caused by variations in the structure of the facial muscle known as zygomaticus major

Zygomaticus major muscle

The Zygomatic major is a muscle of the human body. It is a muscle of facial expression which draws the angle of the mouth superiorly and posteriorly . Like all muscles of facial expression, the zygomatic major is innervated by the facial nerve...

.