Could it be undigested food or result of a colon with too much in it?
For me it happens sometimes and seems like lemon water sometimes gets that out as well. It can also bring some gerd symptoms with it before being released. Could this be candida thing and also with parasites?
I think that might be the case. They also seem to come and go sometimes. They seem tricky to deal with, guess I'll try to go back on a diet tho and see if that helps with it.
If they are flukes (perhaps get a photo next time for a positive id) they are hard to deal with but they need to be dealt with. If you want to go the natural route, Myrrh has been known to kill them.
I know at least i was diagnosed with lyme disease a while ago and seem to woke up coinfections when taking Antibiotics months ago so maybe flukes are what they are. Also have noticed lemon water seems to disturb these things sometimes.. They also leave black dots in stool sometimes which led me to get a colonoscopy a few months ago that ended up showing nothing on it.
I was amazed (and revolted) at how many types of revolting parasties I have once I started cleansing... almost every species there is to know was inside me... all tests coming back negative, but proof in the toilet and out my mouth...