The traditional medical skill of Malaysian aborigines to use "leech sucking blood" to clean impurities in the blood. Today, it is almost lost because the government does not support this folk remedy. It is said that leeches will also bring the micro parasites and bacteria in the fields into your blood vessels. Therefore, these民间 doctors go out at night.
It's not easy for a leech to break your skin and stab its mouth into your blood vessels.