Phellodendron Bark is used to expel fire and remove toxins, clear heat and dry dampness, and remove bone vapor. It can be used clinically to treat damp-heat under the belt, damp-heat foot odor, and bone vapor and labor heat. Phellodendron Bark is the dried bark of Phellodendron Bark in the family of Rutaceae. Its effects include clearing heat and drying dampness (removing heat and drying dampness), removing bone vapor, and diarrhea and detoxification (getting rid of fire and poison in the body). It is mainly used for the treatment of eczema, sores, swelling and poison, night sweating (abnormal sweating after going to sleep and stopping sweating after waking up), spermatorrhea, bone vapor and laborious heat, damp-heat feet, jaundice, damp-heat diarrhea (diarrhea caused by feeling damp-heat) and damp-heat leucorrhoea, and other diseases. Phellodendron Bark can be used both externally and internally. However, Huangbai is not suitable for people with deficiency and coldness of the spleen and stomach (spleen and stomach weak and cold). It should be noted that if patients need to use Huangbai, they should use it under the guidance of a doctor.