Pus in the navel of men may be caused by umbilical infection, umbilical ureter cyst, cellulitis, etc. 1. Umbilicitis: The normal skin barrier is disrupted, leading to the invasion of bacteria near the wound and pathogens in the environment. The pathogenic bacteria multiply and grow in the body, which produces inflammatory symptoms that lead to infection, and pus will flow. 2. Umbilical ureteric cyst: Secondary infection of umbilical ureteric cyst will cause abscess in the cystic cavity. If the abscess continues to develop, purulent discharge from the umbilicus will occur, accompanied by an unpleasant smell of urine. If it lasts for a long period of time, it will form a sinus tract in the umbilicus, resulting in prolonged flow of pus and pus. 3. Cellulitis: it is caused by the invasion of Staphylococcus aureus into the tissues or blood vessels around the navel. The pathogenic bacteria multiply and grow in large quantities in the body, which will produce inflammatory symptoms, thus leading to infection, and then pus will flow. If there are symptoms of pus in the male navel, you need to seek medical treatment.