keep your skin clean and dry. Wash regularly with an antibacterial soap, particularly around your groin area, and dry the area thoroughly after bathing.
Wearing loose-fitting clothing can prevent sweating and the sustained moist environment in which Tinea cruris thrives. You may wish to wear moisture-wicking undergarments or shorts that can absorb sweat and reduce the likelihood fungus will grow. If you wear an athletic supporter, wash it frequently.