I get that as well when flaring...
"digested" blood would be from the stomach or small intestine.
Darker red is usually from higher up in the colon, but that type of bleeding isn't with UC and flaring
is it black?
If you're UC flaring and bleeding, it'll be obviously red, especially around the edge in the toilet and on the toilet paper.
What you're seeing is probably stool and mucus all broken up, not solid.
Are you on meds?
q