What can cause facial hair loss in a 8 week old husky pup...

Loss of facial hair in puppies can be caused by many things: ringworm, mange, food allergies, etc. and when you notice the condition you should take your pup to the vet immediately for testing to eliminate all the reasons and find a cure.

Loss of facial hair is not indigenous to husky puppies. It can happen to any breed.

Tick

You're asking a lot of questions about medical concerns in dogs. Your other 2 threads ask a about bloated bellies in pups and blood in their stool.

These things need to be treated by a vet. No one can give you a diagnosis over the internet and the things you've mentioned are serious and potentially life threatening for the pup or puppies.

Make an appointment with your vet right away.

I agree with Alty, you need to get these pups to the vet pronto!
They have both worms and hair loss, it doesn't sound like they are in good shape at all!

And book your female in to be spayed.