The mud in the navel stinks, indicating that it is caused by an inflammatory infection that has occurred inside the navel. Belly button if not cleaned for a long time, there will be a lot of dirty things inside, that is, mud, after a long time will be secondary to bacterial infection, resulting in redness, swelling, pain, and even pus at the belly button, the general outflow of liquid infected by bacteria will be smelly, you need to go to the hospital in a timely manner to deal with and treat, with iodine volts or saline will be completely saturated belly button, after the use of cotton swabs or vascular forceps to gently put the belly button inside The dirty things completely cleaned out. After cleaning out, we must promptly use iodine volts to clean the inside of the navel again, while checking the inflammation inside the navel. If it is only an inflammatory mass, oral antibiotic treatment is required. If it is accompanied by a local abscess, if the abscess is large, the abscess needs to be cut open and the medication needs to be changed regularly at the hospital, and oral antibiotics are also needed for treatment.