What Causes Bleeding And Pain In Belly Button After Appendix Removal?

I had my appendix removed 8 years ago and it was done by inserting the tubes with instruments rather than cutting open the epidermis. Now I have noticed every 2-3 years, I have had a mixture of pain, bleeding, and/or discharge from my bellybutton. The liquid is not 100% blood because it seems to be mixed with a clear liquid which emits a foul smell. First time that happened there was just pain, second time there was no pain but heavy bleeding, and this third time it is pain and regular bleeding with foul smell. This goes away after a day but this time it has lasted 4 days of non stop bleeding discharge.