tint as red streaks
or stool of reddish color?
Hemorrhoids, or eating something red (beet-root)...are most often causes.
Rough wiping, straining.
Then food poisoning (goes with diarrhea), intestinal worms (Possible: mucus, bloating, diarrhea).
Diverticulitis (bloating, diarrhea)
Crohn's disease (usually start in young adults...)
Polyp, or cancer...well, not impossible in your age, but 50+ is a common age for colorectal cancer.