Dimples are small indentations that can appear on the skin, most commonly on the cheeks or chin. They are often considered a charming feature and can enhance a person's smile. Dimples are caused by a variation in the underlying muscle structure, which creates a small depression in the skin when a person smiles or makes certain facial expressions. There are two main types of dimples: cheek dimples and chin dimples. Cheek dimples are more common and are typically inherited as a genetic trait. While some people are born with dimples, others may develop them over time due to changes in facial structure or weight.