Amaranth, also known as horse toothwort, boiled water can cure skin eczema, dengue (acute infectious disease, visible skin redness like painted), etc., has the effect of clearing heat and detoxification, cooling the blood and stopping bleeding. Amaranth is a plant-based traditional Chinese medicine, which is cold in nature, sour in flavor, and belongs to the large intestine meridian. Amaranth has the efficacy of cooling the blood to stop bleeding, clearing heat and detoxification, and stopping dysentery. Boiled water can be used to treat snake and insect bites, dengteng, carbuncle, swollen sores and ulcers (purulent skin infections), etc., and can be used externally by applying appropriate amount of pounded compresses to the affected area, specifically in accordance with medical advice. The adverse reactions and contraindications of Amaranthus tinctorius are still unclear, the precautions are spleen deficiency loose stools (feces thin and not shaped) should not be used. Amaranthus is often used with other drugs, such as with Tu Fu Ling, Tu Fu Ling detoxifies and removes dampness, and can be used together to treat wet sores caused by dampness-heat embodiment (dampness and heat evils agglutinate with each other in the body). If you need to use horse chestnut to treat skin diseases, you need to apply under the guidance of a physician to identify the evidence, do not self-medication, to avoid delaying the condition, causing adverse consequences.