My fiancé drew blood while trying to give me a hickey?!

AnnaMarie • I`m AnnaMarie. Married 10/14/2017, and our son was born 7/20/2018. 💙
So my fiancé was trying to give me a hickey on my boob and when he stopped sucking there was a bunch of blood on my boob. Not under the skin, on it. He didn't bite me or anything like that, there's no visible injury at all. Is that normal?