An inhumanly disturbing birth defect. A victim would have extremely hard, bleach-white skin, and possibly red blotches near its eyes. As the word harlequin suggests, it has abnormally-shaped skin which breaks off easily, as well as odd-looking lips. It does not live to be very long, as it loses too much blood.
Seriously, PLEASE don't look it up. I know I sound like a chicken, but believe me, there is nothing worse I have seen in my entire life.
It is hard to believe that the harlequin fetus is human.