Pearl is a kind of traditional Chinese medicine, pearl powder for the pearl ground into a powdery substance, with tranquilize the spirit and calm the shock, bright eyes and cataracts, etc., can be used for palpitations and insomnia, sores and ulcers do not converge and other evidence of disease treatment. Pearl is sweet, salty and cold in nature. Attributed to the heart, liver meridian. It has the functions of tranquilizing the mind, clearing the eyes and eliminating cataracts, detoxifying the muscles, moisturizing the skin and eliminating spots. It can be used internally for the treatment of epilepsy, redness and cataracts, palpitation and insomnia, etc. Externally, it can be used for the treatment of skin discoloration and ulcers that do not converge. The drug is mostly used in pills and powder. Appropriate amount should be used externally. The adverse reactions and contraindications of the drug are not clear. If the drug is needed, it should be used under the guidance of a professional doctor to avoid adverse effects.