Thanks for your details. I would say that the yellow spots or lumps in stool are due to fat malabsorption and this term is also called steatorrhea. The important thing is we have to investigate the reason for it. Tab. Zoton do also effect pancreas and there is a possibility that this fat malabsorption is due to that. I will recommend few tests for you.
stool analysis for fat
I will also advise you to visit your doctor for complete examination and evaluation.
I wish you best of luck and keep in touch
Dr. Amir Javed