Hello I appreciate your concern and I will try to help you out in best possible way Yellow discharge from anus can be related to fissure or fistula in anus or hemorrhoids I would like further information to help you better like relevant medical history like diabetes or liver disease do feel itching around anus? have you seen blood in stool? have you taken any medicines or adulterated good Since how long you have this problem? meanwhile try to avoid constipation by taking liquid paraffin like stool softeners Have dietary fiber to increase bulk of the stool. have lots of fresh fruits and steamed vegetables Avoid smoking and alcohol it could be dangerous for you Wash your hands with antiseptic soap or solution to maintain good hygiene Avoid fatty fried junk and cold food since I can t physically examine which gives more clue to diagnose you more accurately So, In my opinion you should consult a gastroenterologist for per rectal examination and colonoscopy if need be. Hope this answers your question Wish you good health