I also noticed that there is a greenish substance on the toliet paper. I do not have diarrhea, but am constipated at times. I'm wondering if this might be something. Dear Shawna, Stool color is often influenced by the diet.
Normal stool can vary from orange, yellow, tan, green or brown in color.
Black, tarry stools can indicate the presence of gastrointestinal bleeding. Maroon, burgundy or red stools indicate bleeding as well. Sometimes stool can be black secondary to medications such as iron or Pepto-bismol or secondary to foods such as blueberries or coffee. If there is concern that you are bleeding from the gastrointestinal tract you should see your physician. I hope you find this information helpful.