Need expert advice on a puppy and ringworm?

the puppy is now about 2 months old he has ring worms for about 3 weeks now since i found out at the vet, the vet scrapped some skin sample and look it under a microscope and told me it was ring worm right away....when i took him to the vet it wasnt as bad he had no hair loss but had some red rough spots on his face, the vet gave me a medicated shampoo called ketochlor to use, i have used it every 3 days for about 3 weeks now....after the first time i used the shampoo on my puppy the hair dropped in the infected area, i've been using it for three weeks now and no improvement but i have noticed just recently like 2 days ago he got ringworm in some spots i havent seen before, they are not as big but i know its there cuz i see a little hair loss and rough red round spot..what do i do? i dont have enough money to keep taking him back to the vet, i need advice....thanx!!!