A permanent mark on the skin present at birth or shortly after.

A distinguishing characteristic, often used metaphorically.

विशिष्ट विशेषता

English Usage: His attitude towards work is a birthmark of his upbringing.

Hindi Usage: उसके काम के प्रति दृष्टिकोण उसके पालन-पोषण की विशिष्ट विशेषता है।