When they lose their baby fat as they get older, their dimples disappear. Other children do not have them at birth, but may develop them later in childhood. In some people, dimples last only until adolescence or young adulthood, while in others they are a lifetime trait.

What is the rarest dimple?

In what researchers called "a rare phenomenon," it's possible that a person can possess a unilateral dimple: just one lone dimple on either the left or right side of his or her face. Even rarer than this sort of dimple, though, is the "fovea inferior angle oris" — aka one dimple on each side of the mouth corners.

Do dimples go away when you lose weight?

In some people, dimples last only until adolescence or young adulthood and later fade away once the muscle grows fully. Ideally, a genetically inherited dimple does not completely disappear. It may become less noticeable as the person ages or undergoes a drastic weight loss.