Belly button itself will produce scale, pollutants, if there is an odor, yellow water outflow, mainly including the following situations: 1, infection: belly button inside the scale, pollutants, human sweating trickle to the internal mix, when the belly button in a closed state, which can produce anaerobic bacteria. If there is inflammation, skin redness, swelling, yellow water oozing around, usually need to be given around the navel and internal disinfection to clear out the dirt and debris. At the same time, observe for umbilical infection or skin infection and give appropriate local medication. If there is a systemic infection with fever, anti-inflammatory drugs should be applied to the whole body at this time. 2. Suppuration: if the belly button suppurates and forms an abscess, it is usually considered whether the abscess is completely suppurated or not, and it is necessary to go to the hospital for ultrasound examination to determine whether the abscess enters the abdominal cavity and also to clarify whether there is pain. If the abscess enters the abdominal cavity, hospitalization for surgery is required. If the abscess is only inside the belly button or outside the abdominal cavity, the belly button needs to be opened slightly to expose the abscess cavity after a clear diagnosis is made, or even the abscess cavity needs to be punctured to allow the abscess to drain.