Cat has strange black things on his anus. Could they be worms or ticks?

Let me emphasize that I don't stare at his rear end obsessively, but he has a habit of pointing the thing right at my face when I'm lying down and I can't help noticing. The things are small and black and stick out from the pink of his bottom. I had assumed they were just little bits of refuse he... show more Let me emphasize that I don't stare at his rear end obsessively, but he has a habit of pointing the thing right at my face when I'm lying down and I can't help noticing.

The things are small and black and stick out from the pink of his bottom. I had assumed they were just little bits of refuse he failed to remove, but as near as I can tell they are part of the flesh. I'm worried they could be worms.
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