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There is still the possibility that the "fleshy thing" is a hemorrhoid, or a polyp, or even that it is a prolapsed rectum. She needs to see a gastroenterologist rather than a GP for a proper diagnosis. Colon cancer is diagnosed with a biopsy taken during a colonoscopy.
Bleeding can be from hemorrhoids or bleeding polyps. The mucus can come from many things. The bowel is lined with mucus producing glands to help the bowel contents slip through the colon. Any inflammation (proctitis) can cause over-production of mucus. So can intermittent constipation.
There is no way to tell exactly what the situation is without a colonoscopy for which she will need to schedule an appointment with a gastroenterolist.
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