To make purple grass oil, it is necessary to cut purple grass roots into small pieces and then soak them in an appropriate proportion of oil for a long time (commonly used oils include olive oil and sesame oil, etc.). ), and finally take out the oil. The soaked oil can be directly applied to the skin, which has the functions of relieving skin symptoms, resisting bacteria and diminishing inflammation.

Arnebia euchroma can be made into Arnebia euchroma oil from root bubble oil. Lithospermum is one of the common Chinese herbal medicines, and it is also widely used in the manufacture of folk remedies and Chinese patent medicines.