Miconazole is used to treat skin infections such as athlete's foot, jock itch, ringworm, and other fungal skin infections(candidiasis). This medication is also used to treat a skin condition known aspityriasis (tinea versicolor), a fungal infection that causes a lightening or darkening of the skin of the neck, chest, arms, or legs. Miconazole is an azoleanti fungal that works by preventing the growth of fungus.