How can ringworm be treated?

Antifungals: With topical antifungal creams or oral antifungal drugs.

This is a fungus!: "ringworm" is such a bad lay term--it has nothing to do with worms at all, and refers to fungal skin infections that can have a circular irritated appearance. Fungus of the scalp: "cradle cap." fungus of the groin: "jock itch." fungus of the feet: "athlete's foot." all respond to over-the-counter antifungal ointments like lotrimin (clotrimazole). Follow the directions, and if no relief, see a dermatologist.