I think he was hit in the shoulder, not face, by Hydell and friends that time.

The Carlo book mentioned something about acne scars, so it's probably that.

But he did get mercilessly beaten by Sal Miciotta in prison so that could have done the damage either.

Quite telling that Casso & Amuso both caught severe beatings once they started to throw their weight around inside a prison environment - though it's somewhat admirable that they had the balls to mouth off at guys twice their size.

I invoke my right under the 5th amendment of the United States constitution and decline to answer the question.