Could they be tomato skins with some seeds semi intact? I see so many things in stool that I have come to the conclusion that either we all have a menagerie of living creatures in us, or there are many transformations of common food material that goes on in the bowel.
What type of symptoms give you the impression that something is wrong? And how long have you had problems?
You can cut and paste previous post[s] to cover these questions if you like, or link us to them. shroom