He was inside his crate like every night. He is in the kitchen/dining area by the sliding door/air vent. Never had snakes inside tho. I asked my in laws about that possibility, the only snake that has ever been in their house was when my BIL bought one home with a tank from his friend before they forced him to give it back
But we do have hobo spiders/black widows/other various poisonous spiders here. I checked his face, didn't find any obvious puncture wounds, vet didn't see anything either. They thought it might have been a spider that bit him when he ate it... Which he would do.
Vet Tech here- Yep when the swelling is on both sides of the face it's usually a bite vs something eaten IME. I would suspect a flying insect is the culprit. yellow jackets, bees or wasps will cause those types of sudden swelling that respond well to steroid injections and Benadryl. The good news is the swelling will go away pretty quickly :-)