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Blood can be very red. But from what I see, blood from facial cuts should be more watery in consistency.

http://i.dailymail.co.uk/i/pix/2008/11/09/article-0-026890B8...

http://1.bp.blogspot.com/_zOUSe8DKLjk/S0ebhT-SvXI/AAAAAAAAAA...

http://english.ahram.org.eg/Media/News/2011/2/3/2011-6343233...

You have to take into account sweat as well. A boxer's face is probably going to be sweaty as they exert themselves quite a bit during a fight. As a result, the blood is going to get watered down.

I tried to find pictures to verify my idea, but every head injury picture I found was of an athlete.

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