Thanks for the query
Bleed during masturbation
can be seen in seminal vesiculitis.
is one of the cause of this,
But it may occur even in other infection.
Please get a trans rectal USG done.
This will show exactly what is happening.
You can meet a urologist
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.