Hello: I know this is an old post, but I'm new here and I, too have been trying to figure out what these cotton balls with legs things are as well. A few ppl mentioned they think it's candida. I have been battling candida for more than 21 years. I have noticed that when I pass these things, I seem to have the typical candida die off symptoms (or herx, as some call it) soon after, so I, too, am inclined to believe they are candida, as everything I've experienced with regard to these things is somehow associated with candida. Anyway, thanks for listening. If ppl are still checking this post and have finally settled the mystery of these little monsters, I'd appreciate if you would post a reply. Thank you.