Dimpled chin, and arise from the lack of muscle tissue

Dimple - the general term used to refer to the depressions in the skin. They appear due to insufficient development of tissues, joins the skin to the bone. Dimples arise where muscle fibers are attached to the surface the deep layers of the skin (such as cheek or chin), or where the skin is connected to the bone by fibrous tissue (on the shoulders, back and elbows). They can occur in places where fat discernible under the skin surface. Location dimples in some places is an inherited trait. Most likely, there is a genetic predisposition to their appearance.

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