The suppository stimulates the bowel wall to contract and force out the stool. If your bowel wall is sensitive, sometimes the bowel may continue to be stimulated after the bowel movement is complete. At this time, only mucous can come out as the bowel wall is lined with mucous. To avoid this discharge you want to de-stimulate the bowel. To do this, insert a water-soluble lubricant such as Surgilube into the bowel. You can also use a hemmoroidal ointment which soothes and de-stimulates the area.