Why After a Local Anesthetic to the Right Lower for Wisdom Tooth to Be Extracted, Got His Cheek Swollen?

Dear Dentist, I am the wife writing about my husband situation.. I am scare.. for his health! Everything started after a local anesthetic in the right lower for an extraction of a wisdom: his right cheek only got swallen. My husband says that the first injection was ok, but after the second one he felt like a pinch in his right ear, like something burning... and it was painful, then his cheek got swollen very fast like a balloon... Why? is he going to be ok? please help us. Thank you!

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