I can't believe some of the guesses here! Why guess if you don't know? People don't wasnt guesses.
They don't look like mucoid placque or remains of bananas!! They are a parasite or a nest of parasites and they look just like the parasites posted on the website Jessiesmom posted above. I have had alot of these 'cotton balls' and worked hard to get rid of them... if they are a nest I never saw the parasite. All I ever saw was the cotton ball. I have cleansed for parasites mamy times and don't have anything now.