Hm, I get this too and have digestive issues, dandruff, etc etc. I put it all down to candida. But perhaps there are multiple potential causes although to be honest that sounds unlikely >.br/>
Thankfully high fruit and greens and lots of mineral water is my main chosen approach for Candida too so... you're probably along the right lines for fixing it anyway!
Have you had it for a long time? Long before starting 811? I would recommend cutting fat very low or nothing (no overts anyway) for a few weeks and see if it clears up or things improve! :)