At least one of the characters has a beauty mark. It is a single small, usually dark, pigmented spot on the skin. It's usually real, but makeup counts as well.
A small, light or dark brown colored, round-like spot anywhere on the body, one Mole is often under the eye, above mouth, or on boob, many Freckles in a group are often on nose, cheeks, above breasts, or on arms. They both shouldn't be confused with birthmarks, which appear after birth or later.