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.[1]
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Dimples may appear and disappear over an extended period.[2] Dimples may play a role in sexual selection.[3] Some cultures, for example Asian and Indo-ethnic sub-groups, prefer dimples as a sign of attractiveness and veracity.[4] 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. Specifically, the presence of a double or bifid zygomaticus major muscle may explain the formation of cheek dimples.[4] This bifid variation of the muscle originates as a single structure from the zygomatic bone. As it travels anteriorly, it then divides with a superior bundle that inserts in the typical position above the corner of the mouth. An inferior bundle inserts below the corner of the mouth.