The birth mark represents various things throughout the story.

The color of the birth mark is red, representing passion and sexuality.

Another theme found within the symbolic meaning of the birth mark, is that science cannot overcome nature.

A small birth mark on his right shoulder is completely away from the Norm.

She apparently has a 'banjo-shaped' birth mark on her left shoulder, though it is never seen.

Her eyes were a dark brown, and over one was the slanting red scar of a birth mark.

They had identified him by a red birth mark on the back of his neck.

The young woman turned white, and said to herself, "It's a birth mark!

She has a huge white birth mark on her face that she says no one was able to get rid of.

It was purple in color, much like a birth mark.