If you are under the age of 40, this could just be a one-off problem that goes away in a couple of weeks. However, it is also possible that the cause is a sexually-transmitted infection. For that reason, I highly recommend you get checked out at your local clinic.
Oh dont worry my bum bleeds whenever I pooh. Mind you my poohs are the size of sweet potaotoes (or yams if your are american)
My point is, we all have problems and we all have to live with them.
This can be a prostrate problem. you must go to your doctor and tell him about it.
It may just be a burst blood vessel but you cannot ignore these things they can be life threatening if ignored