what is frothy phlegm like?

I have been getting a lot of phlegm in my throat lately and after i hark it out into the sink, I can hear it bubbling. It looks pretty much like the inside of an aero bar. Is this what frothy phlegm is like? It is white and inconsistent. Sometimes I will spit out phlegm that is a milky white without bubbling. What could be causing this?

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