I tried searching to see if this question has been answered, but didn't find it.
I know that the dryer often leaves marks that look like streaks.
Are there any other insects or even arachnids that could leave rust-colored streaks that look similar to BB poop?
Just wondering because I found a small medium-brown spot (not quite rust-colored) on my sheet with a tiny "trace" coming from it. No other signs. It washed right out. I was thinking my own blood but am also curious now about other bug poop that could look like it's from a BB, but ain't.