Blue mercury drops, also known as violet drops, are good disinfectants and sterilizers and are non-irritating to skin surface tissues. Commonly used in skin and mucous membrane wounds and ulcers, in order to prevent bacterial infection and local tissue fluid extravasation. Purple potion can condense with the skin surface into a protective film, thus playing the role of astringent, available to prevent superficial wounds and ulcers as well as skin infections, such as small area of burns, scalds, eczema, pharyngolaryngitis, etc., can play the role of bactericidal astringent, skin protection, is the treatment of thrush commonly used drugs. Then use the proportion of 0.1%-1% aqueous solution externally applied to the patient’s skin, 2-3 times a day. People with allergies or a history of allergic reactions should use blue mercury drops under medical supervision. If the color does not go away after using the blue mercury solution, you can use 75% alcohol wipe, and the color will gradually fade after 3-4 times.