Your boy should be examined by your Vet to determine the source of the bleeding as there could be a number of causes from an irritation, to infection, etc. Agree with Jan that there is no way anyone here could possibly diagnose what the problem might be.
I'm sorry your little man is having problems BUT we are not
able to diagnose or give help to him,he needs to see his vet
as soon as possible this IS NOT SOMETHING YOU SHOULD
WAIT ON...please take him in tomorrow without fail.
OR TONIGHT if this has been going on for awhile...
Please come back and let us know what your vet found was
the problem...
Jan