[theBCnut]

It is common to reblock. They can get scarring in there which reduces the size of the opening even more. Watch that purring too. It can be a sign of pain in cats. If when this is all over, he goes back to his usual purring habits, you will know something is wrong if he starts purring like crazy again. Most people know their male cat is having issues first because they start trying to pee in weird places.