What is the meaning of' red mouth' in the yellow calendar?

The evil god in charge of litigation in Han folklore. Every year on the third day of the first lunar month. According to the traditional customs of the Han nationality, it is easy to have disputes with people on this day. In order to avoid trouble, everyone does not go out to pay New Year greetings to relatives and friends, but stays at home and worships God. Therefore, Akaguchi Day is also called Xiaonian Dynasty.