This isn't the only benefit you get from this oil. It can cause redness, itching and soreness. If left untreated, symptoms can only get worse. Wearing breathable footwear and dry socks will protect your feet. It will not cause any type of itching or irritation on your nails. Fungal nail infection can affect one, several, or all of your nails. An infected nail can be permanently removed in stubborn cases.