Daily life always accidentally caused by some trauma, and salve is a necessary medicine in every family, but the market is a variety of salve, in the end how to choose, whether there are differences between these salves, which are more suitable for daily use? Let’s analyze the following common types of drops. Commonly used trauma disinfectant drops are alcohol, iodine volts, red salve, iodine, purple salve and so on. So are the disinfection effects and ingredients of these types of drops the same? First of all, let’s talk about alcohol, the main ingredient of medical alcohol is ethanol. In daily life, it is common for some people to use medical alcohol to scrub wounds to achieve the purpose of sterilization and disinfection. It is worth noting that there are two concentrations of alcohol bought in pharmacies, 75% and 95%, and these two concentrations of alcohol are used differently. The use of 75% alcohol can be used for scrubbing trauma. Medical alcohol is made from starchy plants by saccharification and then fermentation by distillation, equivalent to the process of making wine, but the distillation temperature is lower than that of wine, the number of distillations is higher than that of wine, the alcoholic content is higher, and the ether and aldehyde content other than alcohol is more than that of wine, so it cannot be drunk, but it can come into contact with the human body for medical use. Red potion is also called red mercury. Commonly used red potion is 2% mercury bromine red solution, because its disinfection effect is weak, penetrating and antibacterial effect is also poor, only for the disinfection of smaller wounds on the skin or mucous membrane. It should not be used for large skin wounds and deep wounds. It is contraindicated for those who are allergic to it. Red salve is relatively milder than iodine and is suitable for small wounds. The commonly used violet solution is 1%-2% gentian violet diluted solution, which is an antiseptic and antiseptic drug with good bactericidal effect and no irritation to tissues, and it can condense with mucous membrane and skin surface to form a protective film and play an astringent role to prevent bacterial infection and extravasation of local tissue fluid. It can be used for superficial wounds, ulcers and skin infections, such as small area burns, eczema, herpes, mouth ulcers, tongue inflammation, thrush, etc.. However, when the wound has been infected with pus, purple potion should not be used because it has an astringent effect and will form a crust film on the surface of the wound, making it difficult for the pus in the necrotic tissue to be discharged and spread to the depths, aggravating the infection. In addition, purple potion can make the skin residual purple marks, so it is better not to use it for larger area of skin wounds, so as not to affect the beauty. It is not easy to distinguish between iodophor and iodine, but there is a difference between them. Iodophor is an indefinite combination of single iodine and polyvinyl pyrrolidone. Iodine, also called tincture of iodine, is an alcoholic solution of iodine and potassium iodide. It can penetrate into the skin to kill bacteria (2% – 3% iodine is used for skin disinfection. 1% iodine is used for oral mucous membrane disinfection). However, it should not be used with red saline, as the same use will produce toxic mercury iodide. As compared with iodine and alcohol, iodophor causes less painful irritation and is easily accepted by patients. Moreover, it is widely used and effective, basically replacing alcohol, red mercury, iodine, purple potion and other skin and mucous membrane disinfectants. In addition, low-concentration iodophor is a light brown solution that does not easily contaminate clothing. Although iodophor is widely used in hospitals, non-medical personnel are not as knowledgeable about iodophor as traditional disinfectants such as red mercury, iodine, and violet potion.