Had head cold and snot was yellow then green then bloody now brown. no fever just need to blow nose. brown from dried blood or more bacteria?

Brown snot: Brown snot is from old blood, not from bacteria. Your progression of healing the infection on your own through your body's immune system is perfect. You had a cold, the body sent infection fighting cells to area to fight germs and snot became yellow and then green. Irritation caused some fresh bleeding, now has diminished to old blood. Drink fluids, use neti pot and lots and lots of humidity.