19 scientifically proven ways to cure ringworm fast at home. Use an antifungal shampoo that contain ketoconazole, zinc pyrithione or selenium sulfide. Apply caprylic acid topically. Apply ACV topically. Drink 3 cups of rosemary tea a day. Apply colloidal silver topically. Take 1000 milligrams of vitamin C a day. Use OTC topical antifungal medications. Wash clothes, towels and bedding daily…. Read More »