If at any point you start seeing streaky red lines or general redness around your belly piercing, you start running a fever, and/or the fistula starts oozing a thicker, yellowish, pus-like discharge, you likely have an infection and need to see a doctor for an antibiotic. Piercings can be irritated without being infected, so if you aren't sure, you can visit your piercer first to get his or her opinion.