Make Fake Vajina How Can I Make A Fake Cut That When I Put A Knife To It, It Will Bleed?

How can I make a fake cut that when I put a knife to it, it will bleed? - make fake vajina

I am a director with no budget films by students, and one of my scenes, my "friend" songs on his cheek. Do I have to do when the blade penetrates the skin that bleed wrong. How can I do?

I have blood in latex and wrong it is not easy, I do not know how combined.