@lilianna I don't remember if you said you were diagnosed with having a MAC infection? When you say "dark specs" what color is dark? You did say brown, is that the color? How often do you send in your sputum to be checked and does it go to NJH or Tyler for testing? Can't remember, are you on antibiotics?
My mucus is clear and the plugs that come up are lightly yellow to near white, for now! Hope it stays that way. I have, per the last tests of sputum, MAI, low count. My 'plugs' are tiny so to speak, like specks as you said...... but approximately a couple of times a day, especially after my second nebulizing session of the day I will bring up one or two that are more than what I would call specks but overall tiny in size, maybe a quarter of a mm in size or slightly less.
Barbara