Really need some answers

I have the most disgusting problem ever. My belly button is oozing yellow discharge and it smells bad. I went to the doctors and they swabbed it and got blood work and said I do NOT have an infection. How is yellow discharge not an infection?! It won’t stop and it is itchy and burns. I keep it very clean with anti bacterial soap and it isn’t going away. It’s so strong I can smell it just sitting here. The only thing I can think of is I had laparoscopic surgery on my belly button but a YEAR ago. What do I do?! Has anyone ever heard of it? This is crazy and disgusting and making me very upset. 😔