Bloody vent

[Debora Howe]

The last couple days my rooster has had a lot of poop hanging from his vent, I finally caught him and soaked them in a warm bath of Epsom salt and cleaned him up but his vent was dripping blood. I don't know what that is what caused it or what can I do

 

[MysteryChicken]

Does it look swollen, or damaged? If so he could be getting vent pecked by the other birds.