DetailsRing Guard is a brand of anti-fungal cream that treats ringworm, jock itch and athlete's foot. These infections tend to appear in warm and moist areas of the body, particularly areas prone to sweating. The Ring Guard ointment works by killing the fungus and the fungus spores that allow it to reproduce. It must be used twice a day for about 7 to 10 days for the fungal infection to clear up completely. 20 gm.