There is a superstition that there are crescent lines on the ears.

Superstition that the crescent moon marks on the ears represent good luck and wealth. Crescent grain usually refers to a piece of meat protruding from the earlobe, which is shaped like a crescent, and is sometimes called "Fukumimi". This statement originated from ancient physiognomy and geomantic omen, and believed that the ear is one of the important parts of the human body, and the crescent seal is a symbol of good luck. Although there is no scientific evidence to support this statement, many people still believe it. In China, some people will specially punch holes in their ears or put earrings on them to emphasize their crescent patterns, in order to get good luck and wealth. In addition, some people will stimulate the crescent marks on their ears by massage or other methods to increase energy and effect. Generally speaking, crescent seal is a traditional superstition. Although there is no scientific basis, it is still very popular with some people. This answer is for reference only. Don't be blindly superstitious.