My cat used to have mucusy blood in her stools which was due to a small fissure in the bowel. Does your cat usually have constipation or the runs? If he's been straining due to constipation he could have torn a little bit of skin around his bum.

You could always ring your vet for advice. Maybe have a feel of his tummy to see if he's got a lot of 'matter' in his bowel.

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Owned by Ratty girls Hera, Athena, Boomer and Kitty the Cat
RIP Apollo and Starbuck, together again at the Rainbow Bridge. Till we meet again.