Usually either it is the remains of something that didn't digest all the way (and some meds can do this because the time released part of the thing is a matrix that isn't broken down that the stuff inside slowly leaks out of. Levbid will leave an "ghost" in the stool).The other thing it can be is bits of mucus. Everyone makes some mucus but some people make noticable amounts.If it is really a big concern call the doctor and you can take a stool sample with the white in to be checked out. But usually it isn't anything. Although some parasites can be white, they are often too small for you to really notice, much.K.