Willow Leaf is the leaf of the willow plant, Salix populifoliae, and its effects and actions include clearing heat (removing heat evil), transmitting rash (dispersing rash), diuretic (promoting urinary excretion), relieving pain, and detoxifying. Willow leaf is a heat-clearing herb with a bitter taste, cold nature, non-toxic, and belongs to the lung, kidney and heart meridians. It mainly treats fever, measles with poor penetration, itchy skin, macular rash, sores and carbuncles, dizziness and headache, swollen and painful joints, toothache, cloudy urine, painful urination, scalded wounds, swelling of the front of the neck, and swelling and pain in the parotid gland area. Willow leaves for internal use can be decocted soup, external use can be decocted water to wash, pounded on the affected area, boiled into a paste to apply. This product is bitter and cold, so it should not be used by people with cold constitution, weak spleen and stomach, or those who have been sick for a long time. Please consult a professional physician before using the drug to prevent damage to the body caused by misuse.