Belly button rotten, clinically, according to the patient’s age, the general common causes and treatment methods are different. First, for newborns with navel infections, mostly due to improper ligation of the umbilical cord or care, resulting in local bacterial infection and ulceration. It is often accompanied by redness, swelling, heat and pain, etc. Erythromycin ointment can be applied topically and local cleaning can be strengthened. Second, adults due to the navel is not often cleaned, can cause more metabolic waste accumulation, bacterial breeding and local infection, accompanied by ulceration. Patients with mild symptoms can clean the metabolic waste in the navel by rubbing 0.5% vital iodine or Bactrim ointment, which can better control the local infection. For patients with more severe symptoms and sinus tract formation, surgery is needed to completely remove the sinus tract, and post-operative strengthening of anti-infection and local physical therapy to promote faster healing of the ulcer.