poop question - yes, it's gross

I developed a fistula about three months post op . Stool was dark and sticky. Was advised by the colon surgeon who fixed the problem to take a stool softnet 2-3 times a day and Citrucel twice a day. Stool softner to lesson the hardness and the citrucel to make the stool not as sticky. This seems to work for me right now

Tarry stools - very black, sticky, yucky, and soft to runny- just like tar really.  Melena (blood in stool) also comes with the most foul odor you can imagine.  Lots of things can change stool consistency.  Did you eat something new or something fattier than normal?  Things you ingest can change the color of your stool, not just your meds.  For example, grape Koolade can turn in bright green,