I Have Had A Mucos Discharge From The Rectum For

I have had a mucos discharge from the rectum for now about 2+ years. I've had two stool cultures which have come back negative and recently a colonoscopy, which also came back ok. (one tiny polyp which was non-cancerous). However, I am still plagued w/ this mucos discharge, before/after bowel movements and throughout the day. It's quite annoying I might add, and embarassing. Thoughts?