Antifungal powders are topical treatments containing ingredients like Miconazole or Clotrimazole to cure and prevent common fungal skin infections such as athlete's foot, jock itch, and ringworm, by absorbing moisture and relieving itching and burning. They work by controlling the fungus, keeping skin dry, and preventing recurrence, and are applied to affected areas like feet, groin, and skin folds, sometimes even in shoes and socks, for a few weeks as directed.