Examples from the Web for birthmark
Close enough to see the tiny scar on his eyelid that looks like a birthmark.
"Son of an electric eel," she said when Tel reached her, her birthmark scarlet.Captives of the Flame|Samuel R. Delany
As she turned with a gasp, she caught sight of a face that vanished instantly, the face of the man with the birthmark on his chin.The Secret Mark|Roy J. Snell
It must be a birthmark, or maybe he was too anxious to get to town to-night.Langford of the Three Bars|Kate Boyles