The phenomenon of yellow water after breaking the skin of the leg is considered to be related to bacterial infection, which will cause the symptoms of inflammation and suppuration, and can be relieved by local debridement, topical medication, oral medication and other ways. 1. Local debridement: patients need to clean up the necrotic tissues in the knee area to prevent the development of the decayed parts to the surrounding area, which will cause the symptoms of the disease to worsen. 2. Topical medication: after local debridement, iodophor, fusidic acid, mupirocin ointment can be applied to achieve anti-inflammatory effect, and after treatment, clean gauze can be used to cover the wound area, and regularly clean and change the medication. 3. Oral medication: If the local infection symptoms are more serious, you also need to add oral amoxicillin, cefixime and other drugs, so as to improve the therapeutic effect. All of the above medications should be used under the guidance of a doctor, avoid self-medication to avoid adverse effects.