Pearl, also known as real pearls, is generally used in medicine with pearl powder, first seen in the “Sun Hua Zi Materia Medica”, for pearls formed by stimulation of bivalves such as the pearl mussel, mussel family, triangular nymph mussel or pleated crown mussel. The first kind of sea pearls, mainly produced in Guangdong, Hainan, Guangxi and other coastal areas, to Guangdong Hepu produced the best; the latter two freshwater pearls produced in Anhui, Jiangsu, Heilongjiang, Zhejiang and other places. Pearl taste sweet, salty, cold, efficacy of tranquilizing the main blood and hemorrhoids repeatedly, blood collapse with the next, pressure Dan Shi medicine poison. To the end of the yellow lian within the, take the juice, point red eyes and dark.” It can be seen that the pearl is a good medicine for external use. Li Shizhen pointed out that the pearl can be applied to the face “moisten good color” “coated hands and feet, go to the skin against the skin” and the current Chinese medicine textbook also pointed out: “This product can also be used to treat skin discoloration, now more of this product is used in cosmetics, to Prevention and treatment of skin pigmentation, have the effect of emollient skin.” Modern research has found that the chemical composition of pearls is mainly calcium carbonate, a variety of amino acids, inorganic elements such as zinc, manganese, copper, iron, magnesium, selenium, germanium. Still contains vitamin B, nucleic acid, etc.; pharmacological effects are mainly: pearl hydrolysate can inhibit the autonomic activity of mice, and inhibit lipofuscin and scavenging free radicals; pearl powder extract of mouse sarcoma cells, lung cancer cells have significant inhibitory effect; pearl cream to promote wound healing effect; pearl powder has anti-aging, anti-arrhythmia, and anti-radiation effect. Pearl powder can not only be taken internally but also can be used externally, due to the individual differences in the human body, some people may have allergies after using pearl powder, especially topical preparations, the performance of pearl powder allergy and pollen allergy or other topical preparations allergy performance is much the same, specifically those performances? Allergic skin is characterized by itching, and may also be accompanied by redness, swelling, molting, blistering, or crusting of lesions and liquefaction of exudate. Pearl because of the protein material, so there may be allergic phenomenon, the ordinary allergy is contact with certain allergic substances, other allergies, the reason is the same, you can not use drugs to slowly relieve themselves, until the allergens, completely from the body discharge, the symptoms will disappear. If the local symptoms are heavy, you can use certain anti-allergy drugs such as Cetrimin or. Cetirizine or. Cyproheptadine, or calcium tablets in general, have a very good anti-allergic effect, can significantly relieve the symptoms, local can also be applied, flouro easy ointment, can also relieve the symptoms.