List of products in the National Drug Code with proprietary name . This medication is used to treat fungal skin infections such as athlete's foot, jock itch, and ringworm. This medication is also used to treat a skin condition known as pityriasis (tinea versicolor), a fungal infection that causes a lightening or darkening of the skin of the neck, chest, arms, or legs. Ciclopirox is an antifungal medication that works by stopping the growth of fungus.