Yellow gauze is made of sterile gauze after the invasion of yellow medicine water, clinically used for wound dressing change and infection prevention. Yellow gauze is Revnor, also known as Levanox solution, is often used for trauma dressing changes more than a decade ago, the concentration is generally 0.1% to 0.2%. Mainly used for various trauma wound dressing change and the treatment of infectious skin diseases with exudation and erosion. It has a strong sterilizing effect on Gram(+) bacteria and a few Gram(-) bacteria, and is also sensitive to Streptococcus. The general therapeutic concentration is not harmful to skin tissue. In addition, Levanon solution is also clinically used in obstetrics and gynecology, but the concentration and dosage are noted when applied, and patients with heart, liver and kidney diseases, and intravenous injection are prohibited. Yellow gauze is now rarely used in clinical practice because many sterilizing and disinfecting agents with better efficacy are used in clinical practice. It may be that the user is allergic or other reasons for the use of yellow gauze, which has a more stable therapeutic effect.