I have had recurrent issues with yeast, no matter what I try to do to help it (daily yeast infection tablets, etc.). I get recurrent yeast infections, not only vaginally (inside)... but on the outside of the vagina too (due to the discharge coming out and irritating the fragile skin) and even in odd places like the crack of my butt

(Obviously, yeast can grow in any moist, damp area... yes, including the butt crack)! So I get very painful
open sores in between my cheeks because of the yeast that comes out through having a BM. LOTS of yeast problems here!
In fact, I have wondered in the past if CANDIDA overgrowth is a lot of my problem-- causing many of my widespread symptoms! It is VERY common, especially in women and can eventually cause symptoms similar to fibromyalgia and other chronic diseases.
I think it's a simple test at the doctor to see candida overgrowth; however, it's tough for me to get to a doctor w/o having insurance at the mo.
An at home test is to put water in a CLEAR glass/ cup in the morning right after waking up (when your saliva is fresh)... spit into the water (give it a good wod of spit). Wait about
10 minutes, go back to it... and if the water is clear, you don't have yeast/ candida problems. But IF you DO have candida overgrowth, you will see little streams of stringy mucus dancing around and floating in the water...! I have done it and I have A LOT of the stringy mucus streams "dancing" around. Also, I think the further down they reach, the worst your overgrowth tends to be. Mine almost hit the bottom of the (long) glass!!!
Anyway, that's why I think perhaps some of these "butt secretions" as you say, may be yeast-related (in my case anyway). I KNOW that I have a lot of problems with yeast and that it is, indeed, secreted from my bum-- because I get yeast infections that lie right around there.
So some of the IBD mucus may certainly BE yeast-related in many cases. Seems plausible, but who knows!
Eden