What Causes White Translucent Balls In The Stools?

I have been seeing these white balls in my stool. they are the size of green peas, maybe slightly larger, almost translucent. I usually oly pass one or maybe 2 when I go, and it is not everytime I go. I finally used some tweezers to take one out of the toilet to look at it more closely and was suprised because it was hard like a very thin plastic or egg shell. did not really see anything in it moving around or anything that looked like a worm. my bowel function has changed latelyand I seem to go more than I have in the past, but no blood and very soft stool but not diarrhea. I am on about 6 different meds, but have been on them for quite a while, the only thing new is I just finished weeks of antibiotics for foot infection. Does this sound like a parasite infection, and if so what kind.