Dimples are caused by a genetic trait that affects the skin’s underlying structure. They are typically considered a dominant genetic trait, meaning that if one or both parents have dimples, there’s a higher chance their children will inherit them as well. Dimples occur when there’s a small gap in the muscles of the cheeks, causing the skin to form a visible indentation when someone smiles. Essentially, dimples result from variations in facial muscle structure, particularly in the cheek area. They’re often seen as charming and can vary in size and depth from person to person.