I ... once in awhile will cough up the odd time, ( usually one, and very very small ) gel-like clear translucent ball ( size of a very small pea ) with what appears to be tiny clear air bubbles inside. When I spit it into a Kleenex and squeeze, these tiny bubbles pop! There is no blood or black dots, they are completely clear. Happens maybe once or twice a week ... Sometimes less. I don t have a sore throat, I ve never smoked ... nor do I have any known respiratory problems. I do have heartburn though, but take a daily pill for it. What are these strange little balls, and where are theyy coming from?