Putting a bright red mole on the arm of a young girl, like a section of white lotus, to verify women's chastity was common in ancient times. It is called "Shou Gong Sha". People who do not know the origin of this term might think that "Shou Gong" means guarding that sacred and delicate place. In fact, "Shou Gong" is a kind of lizard, with a slightly flattened body, grayish dark color on its spine, grain-like protrusions, white-yellow belly, large mouth, thick tongue, four feet each with five toes, and many wrinkles within the toes, which are good at adhering to other objects and can walk on vertical walls, just like the common "gecko" we often see.