Poop on the butt is usually a sign of diarrhea. Since you say "coming back", I assume you mean from outside. He's probably picked up some sort of parasite like worms or eaten something that has caused his tummy to be upset.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...