Can eating the blood that forms over an injury poison you?

So I currently have a “buddy” in nursery school and he was picking at one of his cuts. This ended up being a really bad habit and one day he hit his finger really hard on a stove at his home and blood started to swell at his index finger. Well when I was with him I saw him nibbling and eating away at the calloused finger. I yanked his finger out of his mouth and I had seen he had eaten the blood that clotted the injury. It looks like there is no bleeding, is he going to be ok?