The dimple is actually caused by a genetic defect and is seen as proof that malformations can have benefits, as many people see dimples as being cute and attractive. The dimple is due to a cheek muscle not reaching its full length and leaving a small gap. This is caused because of some fault in the development of subcutaneous connective tissue. All babies therefore, have dimples, but as their face muscles grow the dimple, for most people, disappears. As people grow, their muscles and fat grow and change shape in their cheek, so the size and shape of the dimple changes.
Dimples can also occur on any part of the body, but it is a dimple on the face that is most recognised as a dimple due to its prominence.
In some rare cases people develop a dimple on just one cheek, but it is far more usual for dimples to appear on both cheeks simultaneously.
Some people may have a dimple on their chin called cleft chin. Dimple on the chin is not hereditary. It occurs due to the incomplete intermingling of the both left and right halves of the lower jaw during embryological development.