44yo female, never pregnant. navel has brown discharge, mild pain/burning feeling, small red bump near center. no other symptoms. what could this be?

Drainage: The may be a small skin infection in your navel. Sometimes bacteria gets in that area and the navel is not always completely open to air so it can get infection sometimes. I suggest you clean it out 2-3 times a day with soapy water dry it and place antibiotic ointment on it afterwards. If it does not get better in a few days, you should call your doctor