Advice to cure a ringworm/fungus

Hi everyone,

This is my first time having a chinchilla. He has 4 months now and a couple of days ago I noticed a bald patch on his nose. He was constantly scratching it. A vet told us he has fungus and gave us the drops to cure it.

I would appreciate any additional advice on how to deal with this, if you had experience with it?
Thank you!