List of products in the National Drug Code with proprietary name . Oxiconazole is used to treat 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. Oxiconazole is an azole antifungal that works by preventing the growth of fungus.