Everything Hoppy said about boas and how important their hardware is up front is true.. but the injury does not appear to be severe at all.

That looks like the lip is hooked on one or more of the teeth. I see that every once in a while.. You and a friend should firmly but gently retsrain the snake and take a close look, get right in there.

Now, if I'm right but you are unable to see a way to resolve it you might have to see a vet anyway. I just don't see from the photo that there is any real need to call EMS..

And oh!... fix or move your set-up so the boa isn't banging its' face!
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Gus
A. Rentfro
RioBravoReptiles.com

"Quality is not an accident. Perfectly healthy animals are a minimum requirement.. everything else is just salesmanship" gus

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