Will be praying for you. Praise the Lord it wasn’t cancer but...ouch!
My brother had a cyst near his eye that swelled. Fortunately, it was visible and the docs were able to drain it and give him some antibiotics before it harmed his eye - this was a while back and he’s fine now. I’m praying that there was no damage to your brother’s brain from all this, and that God will heal him up.