this could be from an infection in the belly button like an ear infection or of more concern it could be from a deeper infection such as from a cyst or residual tract leftover from when you were in your mother's uterus called a urachal cyst or remnant of the urachus. you need to see a general surgeon. on rare occasions and this is very rare there can even be a cancer in the tract. you may need a ct scan to get this looked at.
what can cause blood and pus drainage from an adult's belly button for weeks even after heavy-duty antibotics?