Is acid blood possible?

I'm designing an alien species, whose blood is highly acidic and can easily cause someone's hand to melt down. It's pretty similar to the Xenomorphs from Ridley Scott's Alien, except for the color maybe.

Now my question is, could something like that exist? Could a creature naturally evolve acidic blood as a defense mechanism? If yes, how would it work and what would it look like?

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Is acid blood possible?

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