feces smearing

my child is 14 and has Prader-Willi syndrome.  He has been hiding feces for a few years but recently, in the last two weeks, starting smearing it.  This is not minor smearing, it is all over his carpet, walls, bed.  He doesn't seem upset, he doesn't know why he does it.  He did it 7 times in 9 days!  Every time we clean it he does it again.  I am thinking maybe we should leave some so we won't "need" to do it again?  I'm really puzzled.  Anyone have any information or comments?  This is not a typical PWS behavior, at least from what I saw on line.


This discussion is related to Smearing Feces on walls.

[aimz723]

Page 415 of this book may help:
http://books.google.com/books?id=HnVOj5_rLpIC&lpg=PA415&ots=19tqZi77g2&dq=Prader-Willi%20syndrome%20feces%20smearing&pg=PA415#v=onepage&q&f=false