Fungal infection is a skin condition caused by fungus. Fungal infection occurs on the body areas that are moist and not well ventilated. It commonly affects the groin area, the area below the breast, underarms, and between the toes. Irritation, redness, itching, swelling, scaly skin, and blisters are common fungal infection symptoms. Though fungal infections are superficial and mild, they can be persistent and difficult to get rid of.