Hi guys i have a question after having my esophagus stretched 2x in a month's time, i always feel like I have mucus in my throat and nothing comes up, but at least once a day a clear mucus comes up and it has some black stringy thing in it? I am not sure how to explain it, anyw can this be dried up blood it i black in color so i am not sure has this happened to anyone else?

my mom told me that it could be residue fro the endoscopy scope? humm