my new born who is only 3 weeks old has 2 ringworms from my cats outside brought him to the dr today…

my new born who is only 3 weeks old has 2 ringworms from my cats outside brought him to the dr today and shs tokd me the medication from walmart to give him might cause chemical burn.. any thing natural i can use on him id rather not deal with chemical burn that will hurt him.. btw no i dont put him with the cats i feed them everyday being my husband works alot and he caught it from me