Whether a birthmark is considered lucky or not is subjective and depends on cultural beliefs.
Some cultures believe that birthmarks are lucky, while others don't associate them with luck at all. In the past, birthmarks were even thought to signify royal blood. If someone believes a birthmark is lucky, they may even think that luck can be shared by touching the birthmark. Ultimately, the perception of a birthmark being lucky is a matter of personal or cultural perspective, rather than a universal truth.