Anal discharge: white, sticky, jelly.

Hello there I'm having a discharge from my butt for 4 months now. I did my physical and everything is fine. I also went to see Gi Special and explain the issues to him. I had a colonoscopy done because i said to him my bowe lmovements  also changed. After the colonoscopy he did not find anything alarming. I don't know if the colonoscopy suppose to help to the source my discharge or did the colonoscopy for others reason. I'm not in pain  and don't have any abscess on my butt. Is just uncomfortable to have the discharge coming out from my anus. But i do have a skin tag for 15 years now by my anus. I read about anal fustila and now im scare.  Hope is not my case. Please any help, i will appreciate.