I had a cold with a runny noise; body feelings tired and later coughing. It begun 3 weeks ago and after one week I was already much better. However, since time to time i feel my noise is blocked and I feel very tired but it goes away after a day.
What ahs raised my concern is that my nasal discharge is light and white (normal) but I see some traces of black in it (like a black line). I am not that much in pollution. What that black lines could be?


