Baxter’s Vet expenses

hi my name is Megan and I’m needing help with vet fees. My Baxter is only 3 1/2 months old and he is currently recovering from parvo and we thought he was doing well but then he got these open wounds which we think is a bacterial infection. Poor baby has a hole is the side of his mouth! I’m trying to do everything in my power to get him better. Any help would be greatly appreciated.