I'm kind of worried because I've been coughing up these black particles in my phlegm every day, and it's pretty thick, especially in the morning. The color is usually grey and it looks a bit like clots. I'm not a smoker and never have been, plus I wear a mask all the time. I haven't had any breathing issues, fever, or weight loss, though I've been dealing with this for about two months now. I tried taking antibiotics but they didnt really make a difference. I'm only on thyroid medication at the moment. Any thoughts on what could be going on or what I should do next?