Your spots are spreading...oh my! I wish we could know what they are...hmmmm.
I was going to say that you could take the psyllium up until the day before your surgery, but now I'm wondering if you shouldn't stop them and see if your spots don't go away. Strange, too, that your bm's are soft. Most people go the other way - harder more constipated poos. So...it looks like your body isn't liking something. Not sure if it's toxins or something else!
Maybe stop and see what happens..since you're going in for surgery anyway...
Do let us know! And if that bath felt good...you can keep it up... Keep drinking water!