Jock itch is a very common groin rash. Roughly half of jock itch is due to fungus. The remainder is caused by moisture, irritation, and bacterial overgrowth. Symptoms and signs of jock itch include pink or red rash in groin folds, itching, pain, odor. Jock itch affects primarily males, although it may also be seen in females. Jock itch is most common in older adults and athletes. Jock itch is often seen in otherwise healthy people.